I've been trying to reverse a short audio file in Logic 9, and the recommended method of opening the region in the Sample Editor (after creating a copy of the original, as a .wav file) isn't working. The reverse options are greyed out. The file was originally a .caf sound effect, in surround. The copied region still has the surround icon on it, even after doing a bounce-in-place, which I thought would make it stereo... Ideas?

Try selecting the file in the Audio Bin and choosing Audio File > Copy/Convert (and convert it to a stereo wav or aiff file. That should work...