I have this very same problem. Chunks of audio, usually small clips that I have split off and moved, will not function. The program displays their full waveform when I’m zoomed out, but when I zoom in, the middle section will be missing. This is currently ruining my movie. 🙁
I’ve tried restarting Vegas, I’ve tried re-dragging the original footage on to the timeline (the chunk is missing even then), I’ve tried updating Vegas.
Help!