I have an armature set up, and it is duplicated from another, I cleared all IPO info, and it works just fine normally, but when I CTR left click the armature and the arm model, and mirror it on the x axis, it wont play normally. I looks fine in the editing window, but when I play, it goes into a weird position. Can someone help fix this? If so, here is the .blend: http://www.mediafire.com/?3efn98hkmstlhx4
Bumped because I really need an answer
When you mirrored the armature by scaling it negative, it messed with the transformation.
It would probably help to have the scale of all armatures be 1.0 1.0 1.0 for the game engine, then edit the bones accordingly. Hope that helps