Currently Being ModeratedJan 27, 2013 4:42 AM (in response to evanderbilt)
If you right click on the media in your event, see if it offers to optimize media. If it does, that will fix it once you optimize.
Also, try sharing your movie and see if the problem persists in the final version. Once you have either shared or finalized, the problem should not occur in the project as you edit.