Sorry to drop in out of the blue (I was reading replies above) but if you're running a PC, that blue-vid problem is 90% likely to be a codec/OpenGL issue. I've experienced the same problem when I run applications that try to reinitialise the graphics process while I've got other programs open trying to handle video or some types of image.
There are several solutions that could fix it, but they depend on what your system configuration is. If you are on a PC, I'd suggest checking out the doom9 site (a search on google turns it up as the first hit). The site has pretty comprehensive guides to a wide range of freeware video and DVD based software - if it's simply a case of you missing a codec, using something like the GSpot tool to check what the average video needs to play will give you the name of a suitable codec. Most vids are compatible with the latest DivX / XviD codecs, so that's a good place to start.
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There are several solutions that could fix it, but they depend on what your system configuration is. If you are on a PC, I'd suggest checking out the doom9 site (a search on google turns it up as the first hit). The site has pretty comprehensive guides to a wide range of freeware video and DVD based software - if it's simply a case of you missing a codec, using something like the GSpot tool to check what the average video needs to play will give you the name of a suitable codec. Most vids are compatible with the latest DivX / XviD codecs, so that's a good place to start.