Hello again, and apologies for the delay.
We looked for reports of this bug and while they're very rare (we only found one connected to rpg maker for now), it seems to be having something to do with how the video is played!
It could be a bug from an incorrect movie file or from the core files of the engine. If it's the latter, we're not sure how to fix it, unfortunately, since it would mean tweaking the engine core files. Perhaps simply downloading the file again might fix it.
Are you using an older windows version? (before 10) The new rpg maker tend to not play nice with them, we've had quite a few incompatibility bugs for our earlier games when they were played on older windows or on smaller screens.
We apologize for the inconvenience! Thank you again for your comments, it helps a lot! :)
We can't wait for rpg maker to release their new engine on unity for things like these...