The Commons Helper tool, which permits moving files from other wikis to Commons, has been working fine for me with English Wikipedia to Commons transfers, but failing when I try to use it on English Wikisource. At minimum, I hope a more informative error message could be generated. When I try to use it on files from http://en.wikisource.org/wiki/Category:Centennial_History_of_Oregon I get the following text:
Querying image data ...done.
Retrieving image description ...done.
ERROR: Warning
And the file is not moved. By contrast, a successful file move on English Wikipedia results in the following text:
Querying CommonSense ...done.
Querying image data ...done.
Retrieving image description ...done.
Transfer successful!
I am not sure where the error is. I do have sysop privileges at English Wikipedia, and no advanced privileges at Wikisource; but I have successfully used Commons Helper from Wikisource in recent months, so I don't think that's the issue. PNG vs. JPG perhaps..?