Is the clip in your sequence scaled before the speed was changed. If so then it may just be a simple case of needing to re-render.
[QUOTE=SVD_Sniper;67963](oh btw, am using PPro V9 as far as I know )
PPro was version 2 last year and this year's brand new version (if anyone actually has taken delivery yet) is version CS3. Which one do you have. My guess is v2.