I'm pretty sure it's bug, but if someone confirms it then it can be moved.
Go to Membergroups > Select group (post based) > change name > Save:
The database value you're trying to insert does not exist: subs_description
or (board Moderator group):
The database value you're trying to insert does not exist: subs_online_color
/edit:
forgot to add error log:
/index.php?action=admin;area=membergroups;sa=edit;group=3
File: /forum/sources/subs/Membergroups.subs.php
Line: 1374
and I have to add that it worked fine on RC2.
I cannot reproduce the "subs_online_color" one, but the first one is indeed a bug.
Fix here:
https://github.com/emanuele45/Dialogo/commit/a9c64b5299d0341d47e39de5f898ed1c9c1c255e
It's a rather generic fix, so it should fix also the other one you are experiencing. ;)
Thanks, it fixed both errors :)