Audacity ® 1.3.4-beta (Unicode)
2 stereo track - 44.1kHz 16 bit
Select the first stereo track.
Click on "Tracks->Stereo to Mono"
The first track converts to mono and the second track disappears
Press play
Audacity crashes.
Do the same, but select the second track instead:
Appears to work, but when "Play" is pressed, Audacity crashes.