Updated to 6.3, shunted some stacks around and just seen the infamous “This document could not be saved” message. Haven’t seen that in a few months now.
Hmmm. I upgraded to 6.3 released version from 6.2.4. Upon restart I got a nice indication I needed to buy Stacks. Re-entered my serial number and all is fine. Just wasn’t expecting that.
Without any further information (Console logs, steps to reproduce, knowing whether this happens with a non-beta version of Stacks) we’re not really able to help here…