I frequently (once a day) get the latest working copy of RoundCube out of SVN and I am currently running revision 2468.  Every time that I try to allow images in emails using the "Always show images from..." link, I get a red shaded box at the top of the page that says "Unknown Server Error!" and then disappears.  The contact appears to have been added to the address book properly and images do show up, but only a few updates (days) ago I was not receiving this message when performing the same task.  Is there something that I am doing wrong or maybe a database update I need to do?  I checked the web server logs and also the RoundCube logs for any error messages and there were none.  This error occurs with all contacts that I perform this action on.

Any help in tracking this down would be appreciated.