Comment 7 for bug 1768947

We've had several reports of whitescreen issues since upgrading to 3.1. I'm still gathering information, but "Cannot connect to offline DB" with a link to the duplicate keys error seems to be the most common form.

Clearing cookies and site data seems to be effective as a workaround, but cumbersome (there may not be staff on-hand to re-register a workstation afterward, for example).