Exporting silence

Hello,

I've been using Audtion for awhile constructing a stereo mix of a few tracks. Nothing unusual, standard multi-track session. Up until the new CC download a couple/few weeks back, I never had the problem I am having now. When I export the time selection shown in the image attached, the first track is silent. It is very, very strange. The only thing I can track this emerging problem to was the new update.

In the corresponding picture, you'll see the top track is the track in question with the underlying track, the result of the export of soloed track 1 (above it). You'll see that silence is all that results. I have tried numerous little tweaks to solve what should not be an issue to begin with. I am dumbfounded as to why this first track will not export with audio. When I play it back in real time, it plays back perfectly.

Also, if I increase the time selection to include track 3 in the export, that track emerges after the silence. Again, you can see in the graphic attached how odd this is. Any help is greatly appreciated as it is a bit of a time sensitive matter.

Many Thanks!