Deleteing Render Files

Got an FCE4 project that I've been working on for a little while. Some of the sequences have been renamed and there were some files in the render directory that appeared to be from the old names, so I thought I'd get rid of them.
Now, when I open the project, I get a whinge about the files not being there (it lets me get on with things, but doesn't seem keen to forget about them forever). Also, I get problems when I drag exported .mov files into iDVD (they're broken). I deleted that com.plist.idvd file (not 100% sure of the name right now). I seem to be able to render the sequences OK with Alt-R (although one of the .mov files is enormous, considering it's not supposed to be self-contained) but find that I can't use the files.
I've heard tell of a Render Manager in FCP, but I guess that's not available for FCE.
So I'm a bit stuck now. Sorry for the somewhat chaotic "stream of consciousness" comments above, but any ideas to get this **** project onto a DVD?!

Alex,
You certainly were stream of consciousness in your post ...
+when I open the project, I get a whinge about the files not being there+
An error message on FCE startup normally tells you that you have missing or unconnected source media files. Source media files are not render files. I don't think I've ever seen a 'missing render files' message at startup. Are you sure you didn't inadvertently delete one of your source media clips? Normally a missing render file will only evidence itself as a red bar in the timeline.
+I seem to be able to render the sequences OK with Alt-R (although one of the .mov files is enormous, considering it's not supposed to be self-contained)+
That doesn't make sense. If you can render the files, great, things should be working ok. The render files themselves are complete QT mov files (meaning they contain actual media, they are not QT reference files), but they are not called self-contained movies (that is an export option, not a render option).
+but find that I can't use the files.+
Are you referring to the render files? If so, how are you trying to use them? Actually, you shouldn't be using them for anything - even though they are complete QT mov files, they are basically for internal use by FCE.
+I get problems when I drag exported .mov files into iDVD (they're broken).+
Exactly what files, and exactly what do you mean? Are you dragging render files into iDVD?
====================
Regarding render files ... generally not a good idea to trash render files until you're finished with your project. That said, given the apparent confusion over the state of your render files ... I'd trash all of them and re-render the entire project. The render files will be in a folder that has the same name as your FCE project.
You could also trash the +Final Cut Express Thumbnail Cache+ and +Final Cut Express Thumbnail Data+ files in the Thumbnail Cache Files folder. FCE will automatically create them again the next time you open the project.
Be sure to empty the trash before you re-render, however.

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