Hi Markus, First I'd suggest that the best supported movie format on the Mac is Quicktime, so you should use the Chimera movie command option "mformat mov", or leave the mformat option out since quicktime is the default. As Damir mentioned sometimes movies play on one screen but not a second one when two displays are used at the same time. I haven't seen that on a Mac but have on Linux. I would not expect this to be dependent on the movie format, but it is possible that some formats allow simultaneous display at two screen resolutions while others don't. It would be worth testing some other movie not made in Chimera in powerpoint in the same presentation to see if it is a specific problem to the Chimera movie. To get higher resolution you want to record the movie with a larger Chimera window. If you are going to play the movie full screen in a presentation than you need to record it with a large Chimera window so it does not have to be blown up too much which would make it blocky. The Chimera supersample option is just a way to smooth the appearance -- it doesn't increase the resolution. The movie encoding bit rate also does not increase the resolution -- it simply reduces the artifacts introduced by compression such as halos around objects. Tom