Black screen problem and file size

Like others I have been having trouble with importing from iPhoto to iMovie. At times everything works just fine but on my most recent project I have been having a terrible time with the preview screen being black. I have used this discussion forum to try and resolve the problem. I've tried many of the recommedations but the problem continues.
In one thread it was mentioned that file size might have something to do with the problem. I think there may be something to this. I've noticed that any file that is 1MB or less shows just fine in the preview window. Files between 1-2 MB seem to have an erratic pattern of loading and files above 2 will hardly ever load.
Unfortunately I seem to have a lot of photos in the latter category (taken on a recent trip to New Zealand). I'm hoping someone can give me some hints on how to reduce the size of these files in a "batch" fashion. Perhaps via Photoshop?
Also, has anyone else noticed any connection between file size and the black screen problem.
Thanks.
Alice
iMac G5   Mac OS X (10.4.8)   iLife '06
iMac G5   Mac OS X (10.4.8)   iLife '06

Matti,
Thanks for the reply but that isn't the problem I'm having. I've read plenty about not emptying the trash and have not done that.
The problem I'm having happens before the picture is even put in the timeline. When I click on media, go to iphoto and highlight a picture that I want to place in the timeline I will get a black preview screen with the scrubber arrow running across the bottom. Through a rather tedious process I think I have determined that the problem is related to file size. If the jpeg file is greater than 3MB it will not load. Jpeg files under 1MB load wonderfully. Those between 1-2MB are erratic in whether they load or not.

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