Something very weird has happened. Without warning (and without me changing any settings) the movie clips from my digital camera that I uploaded into my MacBook on holiday (along with the stills, into iPhoto) now will not play. 1. They played fine when I uploaded them and checked a couple. Normally, when you click on a thumbnail, it plays in Quicktime. Now nothing happens. 2. If I go to the file in the Finder, those that are .mov will play in a grainy, jerky way. Those that are AVI will play ok. 3. Why are some .mov and some AVI? I follow the same procedure regardless - it seems quite random what format they are. 3. I have iLife 09 and Snow Leopard, and have updated all the software. 4. I cannot drag the clip out of iPhoto into another file. The odd thing is that this started happening without any warning. It wasn't immediately after a software change or anything. Thanks in advance!