Trouble synching with WebDAV, error ID: 135118431
If I sync with my mac laptop or PC desktop using Firefox add on or the stand alone app I get a exclamation point icon after syncing with an error. The errors vary but the most common one is "HTTP 500 error from WebDAV server for GET request". I cannot be certain but everything seems to be syncing properly -- so maybe this is a non-issue but it is a little disconcerting to see an error message every time.
Zotero uses standard WebDAV commands and it works with standard WebDAV servers, but it seems that 4shared'd implementation is not standard.
The 500 error is a generic/unspecified server error. No client would be able to deduce the cause. If 4shared thinks the client is to blame, they should be able to say what is causing that error.