Problem with Patterns

[Glamourcat]

I've been having problems loading the custom patterns. Any time I go into the customization screen to change the pattern on something it says it's "materializing materials" and then never loads anything. It just locks on that loading screen. Has anyone else had this problem? What can I do about it?

[whiterider]

This is most likely caused by a broken downloaded pattern. :)

[Glamourcat]

How do I find the one that's broken? I've run the Dashboard and it's found all my broken files. I've deleted the ones that came up. How do I locate any that it's missed?