XMB Forum Attachments not working

We have a client who is using the XMB Forum script. It seems that the Attachment part of the script stopped working. Has anyone experienced this before? I know the images are inserted into a MySQL database. That particular database is about 57MB. That should not be a problem should it? It seems that the files are not being uploaded to the /tmp directory. The upload_tmp_dir was not set in the php.ini file. I set it to /tmp but that does not seem to help, nor does it work with it not being set. Nothing has changed on the server that I am aware of.

Any help would be appreciated.

Thanks