Previewed effects continually dissapear

[Guest_imported]

Premiere 6 on PC under Windows 2000. My previewed effects continually dissapear and I'm having to "Render Work Area" over and over again. This can happen by my doing something as simple as muting-un-muting an audio track, or by making other non-effects-related changes to the timeline. I'm previewing to disk, and when it happens the preview files remain in the preview folder but are not retained as previews in the timeline. I've tried using the same and different drives, but neither helps. Has anyone else experienced this, or can anyone shed any light for me?
Many thanks,
Steven Thun.

 

[CkRoach]

I don't have a solution but maybe a workaround..... While holding the ALT key click and hold in the timeline, then move mouse back and forth to preview without rendering the clip by....right click preview..

 

[rsandelius]

Do you have a cheap capture card? If the card's not realtime, then whenever you shift or change a track nearby (just think if there's ANY way it could effect the problem clip), it'll force a re-render. BTW, thanks to the other guy for the heads-up on the hot-keys... that's going to be really useful.