Upgraded the family iMac last night, and now Lego Universe is unfunctional. Digging under the covers, it uses the Windows-to-Mac wedge Cider from Transgaming, and this is what seems to be failing. By walking around the normal launch sequence and doing a "show package" on the app's icon, I can get it to boot by starting up the base process in the MacOS folder in the package. However, once it starts up, all the graphics are scrambled, even though the sound comes through. This one might take some time to sort out, as there's no mention of it on Transgaming's website, and there seems to be a lot of titles that use it.