Yes!
I second that.
I have a SETTINGS PAGE with tabs and, with the most recent META-BOX-COLUMNS (Version 1.1), the HTML completely breaks up.
If I turn off the META-BOX-COLUMNS Version 1.1, problem disappears.
If I revert back to META-BOX-COLUMNS Version 1.0.0, problem gets solved.
Or, as mentioned on the topic already, if I do remove all my fields (or some of my fields) of type "HEADING", problem is gone as well.
So, definitely we have strange a conflict between MB-COLUMNS Version 1.1 and HEADING fields.
Regards,
G.