This looks like a confirmed bug:
but I’m wondering if it’s just a bug for a few of us, or it’s a real bug for all the installations out there.
From my point of view, this is a serious bug, as I cannot use the CRM to send out campaign emails anymore, but maybe this is just a problem on my installation.
Is there anyone else who can confirm this is a general issue and not a local problem on my system? Thanks a lot.