I have a video file with multiple audio tracks. When I try to go to Audio > Select Track and disable some of them to check which one is which, the next time I go back all the tracks just appear to be the same and track 1 is always enabled. If I try to disable it and enable track 2, when I check again just track 1 is enabled.
I see, the audio tracks configuration dialog exhibits a very minor issue of pre-selecting the first source track for every disabled output track on dialog construction, even if the number of active output tracks is less than the number of source tracks. The issue with that is that simply enabling a formely disabled output track will create a configuration (multiple use of the same source track) which Avidemux doesn't support yet, displaying a corresponding error message on accepting the dialog.
IMHO, a better approach would be to set combo box index to a source track not already in use and, as an enhancement, to add a "Restore default" button.
The lack of differentiation between source tracks (in dropdown menus) and output tracks (the "Track 1", "Track 2" etc. labels in the leftmost column of the dialog) may cause some confusion as well.