It seems (haven't tried to reproduce it myself) that, if you are logged in without the remember-me cookie, open the release editor, make some changes, then submit while the Catalyst session has expired in the meantime, you get the message "[object Object]" on the edit note tab (see attached screenshot, from http://www.tenkate.net/mb/20141012_unable_to_submit_edit.png). This isn't really helpful for a user.

It should probably at least give a more descriptive message (such as "no longer logged in" or something), perhaps even explain a workaround (log in from a new tab, then resubmit).