There are more cutscenes in the game (one after the blessing ceremony late in the game and one at the end of the game... I think the rest mostly use the game engine). I don't recall this problem being reported before, though, so I don't know if the later videos are also likely to be effected.
At least in the disk version there is a configuration file edit to skip the intro videos (see here
), but that shouldn't prevent the intro from being run from the menu. Also in that topic is a command to prevent the game from switching resolutions for video cutscenes, which could help (worth a shot, anyway).
The resolution switching in is indeed very annoying, especially when you Alt-TAB to Windows and back again. Oh well, for cutscenes this behavior can be prevented with the following line in the config.div file:
resolution switch 0
With that all cutscenes will be played in 640x480, while the monitor resolution stays at the resolution you play the game in, for instance 1024x768.
Did you try at a lower resolution, without the font enlargement patch, etc? (ie when it was first installed)