Just a short post this time: if you experience symptoms like:

• no one able to edit anything on a MOSS site
• weird permission denied errors for admins
• buttons in the GUI disappearing

then maybe your MOSS site got into read-only mode. Happened to us today, just like that. People swear they didn’t touch anything…

Fix this from central admin.

EDIT: Well, apparently I’m not the only one to experience this issue. This blog post describes the exact situation (which is obviously related to stsadm backups) and also offers a possible solution – adding the –NoSiteLock switch to your backup task.