Limit on audio shifting

[TCmullet]

I have a M2TS file who's audio is off by a large amount.  I need to shift the audio about 26700 ms (26 seconds).  When I save, then load the new file into Avidemux, there are NO audio tracks.  Yet MediaInfo shows a good track.  Is there a limit as to how far in the future (or past) the program can shift the audio without messing up something.  Wish it would give some kind of error message or at least not allow an illegally high value.  I will try to shift in steps; multi-generations.  I know it can do 5 sec. (5000 ms).  But I had to have needless steps.

Update:  Now I can't shift even 2000 ms.  Am struggling to figure out what's going on.