I have been running the new rc 1.23.1 viewer version just fine on my new imac until I played with a few debug settings. now it is totally flipped out. The screen goes nuts with anything but the lowest graphic settings. I've been running on ultra before with no problems. I've reinstalled, reset to default, cleared cache, anything else I can do? Also, when I run the regular sl viewer, everything works just fine. running all on ultra with no problems.
edit: looking at this a bit more it seems to be a problem when antialiasing is turned on in the new RC, no problems with it in the regular viewer however.
ok after considerable time dealing with a borked viewer, I was able to get it working by going to [YOUR USERNAME]/Library/Application support/SecondLife/user_settings and deleting my user settings. You get treated like a noob upon restarting, but any wacko preferences that you had before messing things up are gone. my problem solved.