[Q] Scroll for segements with bevel doesnt work - OSX Bl 2.77

Hi all, i recently noticed that when im using the bevel tool and want to add segments the scroll function doesnt work. Ive tried to reset everything to factory settings and see if this is the issue. Didnt seem to help.

Im on OSX using blender 2.77

Are there any settings which i should check? Could this be due to the mighty mouse?