this is really weird i have to present today in the evening and i was practicing my presentation using my 27" imac which has an IR receiver and i was using powerpoint 2011 but now the apple remote is not working? I practiced earlier a few times and it was working perfectly fine but now i reopen the file and try to practice and the remote is all glitchy it wont change slides but it will increase/decrease the volume. I need urgent help because i dont want this to occur while i am presenting. Any reasons to why this might be happening?