This is what happens and it seems to be related to the IP version and not VMPro:
15/09 14:39:34.580 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\5368274251a3464bab5e87fe556dada5.wav"
15/09 14:39:34.656 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\8d28236b1fa94280b6928c633a1b67d0.wav"
15/09 14:39:34.773 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\405e10be34df45e0b29b1bcf568f05b9.wav"
15/09 14:39:34.879 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\39e4d87324174eee8854707ee5e485ac.wav"
15/09 14:39:34.953 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\928ecaf75fc248b9bd97c3ec609ab239.wav"
15/09 14:39:35.038 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\038253ad4a884a80aa228fb04d647855.wav"
15/09 14:39:35.114 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\b024a921acdc4705b8511ac1beb38ea0.wav"
15/09 14:39:35.207 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\f70d3d39dea94b5c8fc4142b4286a6e7.wav"
15/09 14:39:35.291 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\4b0a98833168403c9df375b58faa7181.wav"
15/09 14:39:35.370 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\901a3ba8c9f24ed392d262a0b6c747dd.wav"
15/09 14:39:35.503 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\c51c6c70a02146e99902e9c6926d0b72.wav"
15/09 14:39:35.592 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\cefc876884f2402d83c5c0d7b055fb82.wav"
15/09 14:39:35.655 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\df09022965c3418d9923a803c68ba762.wav"
15/09 14:39:35.733 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\9f4fbdc4c1cc4fbe82b9ecef9844c6c3.wav"
15/09 14:39:35.810 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\e4b3b245fe3949868a5cf8c18e33a1c7.wav"
15/09 14:39:35.856 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\c40ef8b5bdcd4248986fe3e7b2aab5f1.wav"
15/09 14:39:35.945 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\1a37a04219c64843a98ce6d75cc2b339.wav"
15/09 14:39:36.056 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\d8309730e49a4407a03819997e5c35de.wav"
15/09 14:39:36.132 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\a240c0ae69ca4fe7916fbe7f599b7d87.wav"
15/09 14:39:36.203 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\335d26037c5a4c5b87605f2632d6eba6.wav"
15/09 14:39:36.300 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\9312cd7c0ff042d1a9eb82ccbd08d2c9.wav"
15/09 14:39:36.424 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\3864634440c4478695ca41764695830a.wav"
15/09 14:39:36.498 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\f0d2775dc3e149e58590b08d255a929c.wav"
15/09 14:39:36.567 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\70ba63e96a134bbdba06ceedb287fa6f.wav"
15/09 14:39:36.782 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\11ab6765e08549ce9977c1e16076791f.wav"
15/09 14:39:36.875 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\b5f6a1806b7647b38308c5dc2faf544d.wav"
15/09 14:39:36.977 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\79139c009f734adfb71fa8939d072e71.wav"
15/09 14:39:37.038 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\991532e4967e4075a68627f274f3b055.wav"
15/09 14:39:37.107 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\915a9bb054a1492b9b89b39f2ab321ed.wav"
15/09 14:39:37.173 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\2fa8b57834b746d59f4a3bd6eba86b89.wav"
15/09 14:39:37.244 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\03a782f73cd8414994f9e14f04d399a6.wav"
15/09 14:39:37.308 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\06eab778c3bd4923933305ac33325264.wav"
15/09 14:39:37.445 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\bdfed17ef9be43f08b99b42d261abc49.wav"
15/09 14:39:37.570 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\43054a082fb448b3b94e87eaf4611678.wav"
15/09 14:39:37.651 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\df939753535c4cfda334340e48cf4312.wav"
15/09 14:39:37.744 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\395d39da26874e3593fd226a6ac1d7ea.wav"
15/09 14:39:37.956 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\c44835f396ac46d49903e20f41438e5d.wav"
15/09 14:39:38.045 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\bdf0ae1c45fa4a788056299f6f8f0e0f.wav"
15/09 14:39:38.164 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\58e3d55440d94fc0aa37967ed2a9df0c.wav"
15/09 14:39:38.297 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\8924d6bcf28d4bc59178757197c3f0de.wav"
15/09 14:39:38.382 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\d1d106d6467645849a302db7096c9c90.wav"
15/09 14:39:38.497 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\c3925f0b662f4b2c9f6f11bdd243ff56.wav"
15/09 14:39:38.709 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\981a1a636b2746569f7551544efe2385.wav"
15/09 14:39:38.792 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\31bbb403ab62434db4f3c49bdb40f28a.wav"
15/09 14:39:38.895 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\37700bc2aad542e1aab2993411c08e2f.wav"
15/09 14:39:38.969 vmprov5s (22,2) 10cc,12d8: Failed to locate CHUNK "NAU8" in WAVE file "C:\Program Files (x86)\Avaya\IP Office\Voicemail Pro\VM\Accounts\Recepten\528133d3134b4e64921bcb75bfcb207e.wav"
BAZINGA!
I'm not insane, my mother had me tested!