What I meant was, I think it has issues initially trying to establish clock on boot-up. This has happened to me on a 412 and Dual-PRI ONLY. On two occasions. However, once the PRI was programmed (trunks, etc, and proper clocking option chosen, all was well. It never needed to be worked with again. It was just intially adding a Dual-PRI on an already functioning site.
For clocking, you can have only 1 NETWORK and 1 FALLBACK. If multiple are set for NETWORK, it can cause issues.
Hope this makes more sense...
Kris G.