Only labels are sensitive in buttons
Tested with OpenMW 0.33
Buttons in game UI are not sensitive unless you point the mouse cursor at their label. Only then the button highlights and can be clicked. If you point the mouse cursor somewhere else, e.g. somewhere between the button's bottom left corner and the button's label, the button does not react to clicks and does not highlight.
I am not sure how did it work in vanilla, but it's such a annoyance I doubt it was the same.
(RM-2104 from redmine: created on 2014-11-05 by Jarda Benkovský, , closed on 2014-11-11 by scrawl .)