Interactive buttons disappearing when converting from CS5 InDesign to Interactive PDF???Help???

You mean form control buttons?
If I'm not mistaken, interactive PDF forms can only be directly created since InDesign CS6.
Before that, they need to be created in Acrobat I think. I've been wrong before though.

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Hi thank you for getting back to me - simply had to remove and reinstall Acrobat pro and all works fine now. I was able to make the interactive PDF in InDesign5 - all looks good