Sound renders ... only partially
Hello,
I have a film I want to render, but I'm missing ONE audio track, even that using preview it renders fine. A different audio track renders however fine an is available.

A1 renders fine, A2 does not. I hear the sound, however, in preview. A2 is the entry jingle, that I even converted to WAV, uncompressed. Any ideas?
Premiere 12.0.1 - Build 69 on Windows 7.