FLVPlayback little problem

Take a look (click on one of the right banners):

http://www.videomakersrl.com/video-maker.html

the lightbox should almost immediately play the videos, but instead (only) with ie7, the video take a REALLY long time to start. All 3 videos. But only the first time I play them.
So, I suppose there’s maybe some loading or buffering problem that occurs only with ie7.

The swf files are simple default FLVPlayback pointing to a .flv in the server.

Could you maybe suggest me some way to optimize the playback so that will start soon in all browsers? I’m a quite experienced as3 programmer, so feel free to post some cute actionscript :wink:

Thanks!!!