After upgrading my DevExpress XtraEditors controls to version 6.2.6, I am no longer able to open any existing DevExpress form containing an XtraTabControl (NullReferenceException). Neither can I instantiate a new XtraTabControl on a new DevExpress form.

Removing MM.NET DevExpress controls resolves the problem.

I did not check every XtraEditors control in the toolbar but the rest of the controls appeared to be working.