Sorry about the inconvenience. This sounds like it might be related to a problem we've seen before,a flash control used by our infrastructure for their standard upload page. We're trying to get changes to eliminate this extra decoration of the page, which has caught browsers like Firefox before. Since we're still trying to accomplish this, could you do us a favor? Is there any way you can find a Windows machine running Internet Explorer just to do the upload? (That browser seems to work.) If that's too painful, we might have an alternate, painful way to do it, but we'll hold that in reserve.