if one uploads a remix they will get an error back. But this is a flase error in terms of the upload. The file actually has been uploaded and the page made. You can go to and continue uploading other files. But some people see this error as a failure to upload and resubmit the file. That creates multiple versions of the same file.
*** Bug 25176 has been marked as a duplicate of this bug. ***
Closing all openclipart bugs as openclipart is now on launchpad, as per request from Jon Philips.