Error with sync

I've submitted a report for an error during sync: 119716383. While trying to sync the library I get this error:

0x80520015 (NS_ERROR_FILE_ACCESS_DENIED) [nsIZipReader.extract]

It only happens when I'm using WebDAV to save my PDFs (if I use Zotero file storage I'm over the quota). I'm thinking probably linked to the fact that I recently upgraded my laptop to Windows 7 with a clean install, and I'm wondering if that affected things somehow? That's when the error started--over the weekend.
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