I have encountered this problem in several of my projects after I have reached a certain stage in the project... ie. quite deep into working in to the project after several days with about 90 tracks (audio and software instruments). What will happen is certain tracks will just stop playing and go silent for several measures or bars during playback or bouncing. This can happen to any track, audio or instrument, anywhere in the project at any time. I have checked for any rogue automation, selected the channel strip from 'read' to 'off'. I have disabled any potentially problematic plugins. I am not using any demo plugins with audio drop out restriction. I have removed fades from audio regions yet the problem still persists. If I play the project from the start of the problematic region, the track plays fine. It it almost as if it cannot read ahead and process the tracks properly. Some technical information: Mac Pro 8 Core OSX 10.5.8 Logic 9 8gb RAM Is anybody else experiencing the same issue? I have searched high and low for a solution for this but no luck... I hope you can help! Thanks in advance.