Hi. I changed my Windows 7 display to large font (150%) and then found that if I tried to overrride a rule for an object in SCOM 2012 console I got a weird display, nothing like the usual one. When I changed my display to medium (125%) the override displays correctly.
I thought I'd post this because I spent a while deleting profiles, re-installing SCOM console etc. before I figured it out. Might help someone else...