This was working just fine and now its not, when I copy a file and open Dropbox from within iFile then try to past into Dropbox I get the error "Upload of file xxxxxxx failed"

I have iPhone 4 IOS5.0.1 and iFile 1.9.1-1, I have uninstalled iFile and reinstalled, deleted the preferences file via ssh and still no joy, any ideas?

Thanks all