Major problem with video playback

[Natalia]

Hi there, I hope this forum is not completely abandoned yet.
I have been using Miyu for some time, but lately (about a month ago) it started crashing on random ocasions, and very often too - getting it to work for a full minute without crashing was impossible. I couldn't fix this, and having some other minor problems with my Mac I decided to reinstall the system completely. Today I installed Snow Leopard, then I installed all the updates, then DivX and VLC and MPlayer and then I installed Miyu and tried to create new file. To my surprise any video file (including the ones that I had edited earlier without any problems) had the same problem:

"Name: Keyframe Rate Low
Description: Movie file /Volumes/My Book/Wideo/file.avi has an estimated seconds per audio keyframe of 0.115200
This may cause scrubbing to be choppy.
Cause: /Volumes/My Book/Wideo/file.avi
Reporter: Preferences
Tag: FFMY_PRFMOV_AKEYFR"


The video would load and play for about a half of a second, then stop. Fast forwarding and rewinding works normally, the video just won't play. Is there a way to fix this? Please, help me, this is my fauvorite subtitles editor for Mac and I would love to keep using it!!