2.0.0.100 does not save bitrate

[nriverag]

When converting mp4 video to xvid (AVI), in quality advisor,
the number put in video bitrate, it changes every time I go out and come back.
1200 to 1000, then 1000 to 800.
When converting it the video is of low quality.

Is this a bug?
2.0.0.88 work well.

Regards

[JJ]

Where did you get 2.0.0.100 ?