Interesting. I have only seen similar where Track Keyframes (via the Audio Mixer) were set. Just to make sure, toggle your Keyframe View (Track Header) to Track Keyframes (default is Clip Keyframes), and check that area. Track Keyframes remain, even if Clips are moved, deleted, or replaced. They affect the Audio Track, regardless of what is there.
Otherwise, I have not idea of what is happening to create a "dead spot" in your Timeline.
Thanks for the quick response... well, there are clip volume keyframes, which simply increase the volume slightly then come down slightly to add effect to the video timeline... However, again, if I drag the clip to the left or right, I can here just fine, if I drag it back to the same area - same issue. With that said, I would obviously be looking more at master track mix keyframese, and there are none. I'm at a loss, although I may try reconforming the project files and see if that changes anything, but I think that's unlikely to do anything if it's an area in the timeline.
Problem fixed... I simply changed/toggled the master track setting to off (played the clip without no issues) and then back to Touch (played with no issues) as I will be adding keyframes throughout when I'm mixing the audio and rendering a final video.