Well, the "Serious Error" is popping up for me. Here's a bullet list of where I'm at:

• it's only happening with a custom world I created
• I've deleted DCCache files
• I've applied the ultimate fix
• I've tried the unlocking option on the EA folder properties. I also downloaded CCollomb's Unlocker but it told me there was no locking handle found on the EA folder.

I've Googled around for the last half hour or so, and tried all the fixes I could find.

When I exported the world, I had just cleared my DCCache. But the world used custom content; is it possible I goofed up in that manner?

Thanks so much for all your help,

Sarah

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EDIT: I'll try to export my custom world under a different name and see if that does anything.

EDIT 2: After exporting my custom world under a different name, it seems to be working just fine. I'll leave this here in case anybody else has problems, I suppose.