ScummVM 1.5.0 daily build: git e8ad4df1
Mac OS X 10.8.2
Pegasus Prime/Macintosh
When attempting to use the nonviolent path to complete the Mars mission (drain the enemy ship to 10% and use the tractor beam, then transport over), the Transport button appears to work and plays the transport animation as expected, but as soon as the animation finishes, the UI displays momentarily, then you are taken back into your ship before transport. You can hit the Transport button again and again, and the same thing will continue to happen.
Please do not file bug reports about pegasus at this time, it is not supported.
I encountered this once before when playing a long time ago, but I was never able to reproduce it again. Valgrind has showed up nothing as well.