This is really annoying. I have a 193MB .pdf file to upload to my Dropbox account, and no matter what I do, it won't upload. I've tried both the advanced upload method and the basic, after Dropbox told me there was a "flash error" and to upload using the basic method. The problem is, every time I try the basic method, after several minutes of trying, I get the error message of "Problem loading page...". I've checked to make sure everything is fine with respect to the file and all else, but I haven't found any reason this should be occurring.