I get a "Cannot Create Signature for <charactername>" when I run updates for my characters. No error message, just lists it as part of the output. I'm not using uniuploader either. Checked for GD2 and it looked ok.
Only thing I can think of was that I recently migrated to a new hosting company but I copied everything from the old server to the new and all of the setting are the same. Siggen was working fine before the migration
Also tried resetting to default setting via the webpage and it didnt work.
http://www.restless-souls.org/roster/