Since updating with SR1 there has been a significant lag when switching cameras and when typing text in PP2012 (Mac). First there is a delay of a coouple seconds when nothing happens, then there is a further delay of 3-5 seconds while The Beachball of Death spins. This did not happen before SR1.

An odd thing with the typing -- this lag thing happens even when typing in a Save dialog as well as typing in parameter values or naming something to save to the library. 

Anyone else, MAc or PC, see this?

A nice fix that is not documented: I no longer must move my cursor over the Preview window before any action in the Library takes effect. This was a problem in the original PP2010 and was fixed in one of the SRs, then appeared again in the original PP2012.