Hi everyone, I've already solved this issue for myself and thought I'd post in case anyone else sees a similar issue. I recently upgraded an environment from 3.02.02 to 3.14.03 and after the apparently successful upgrade we were unable to check-in any overdue items. When we tried to check-in via the Circulation>Check-in interface we would receive: No branchcode argument passed to Koha::Calendar->new at /usr/share/koha/lib/C4/Overdues.pm line 299 For help, please send mail to the webmaster ([no address given]), giving this error message and the time and date of the error. And in order to resolve it, since we don't charge fines anyway, I disabled the "CalculateFinesOnReturn" preference setting at Administration>Global System Preferences>Circulation and now receive no error. My guess is that it had something to do with the 'default' fine rules I had set previously, but again since we don't do fines anyway I was OK with just turning them off. Hope this helps someone else. Steve