[galaxy-user] Export to file

Hi list, Is there a currently a known problem with the "export to file" function? I'm trying to migrate some data from the public galaxy to a private one; the export function worked well with a small (~100mb) dataset, but it has not been working with larger datasets (>2GB) and I get the error: Server Error. An error occurred. See the error logs for more information. (Turn debug on to display exception reports here). Is there a limit on the file size of the export? If so, what is it? Thanks in advance, Dave