[crypt0r]

Good evening all. Basically my problem is as the title, pro tools 8 isn't showing some waveforms. The audio is still there and still playing. Some of the waveforms are showing but others not. I do have waveform selected as view.
Any idea whats wrong or how to force reload the waveforms?
The session was originally created in pt 7.4 (just upgraded to 8 a few days ago and this is my first time using it). I'm using a macbook with osx.6 and the prerelease of pt 8 (8.0.3 I think) with an mbox 2.

Thanks in advance.