Mateo, OS 10.2.1 was not released to the public yet. A pre-release build was seeded to some developers though. Be sure thought that this is a Carrara bug and not an OS X bug. If it was an OS X bug, then Eovia would have had nothing to fix. As for how I switch, pick your method, it will still reproduce the bug. CMD+TAB or the Dock. My advice to eovia (like you really need it! ;-)) is to get Carrara tested and working correctly on OS X 10.2 as this is what is shipping with all new macs, and has been a huge success, selling more copies during the first two days then any previous Mac OS. This is also the version that will prompt most IT folks to upgrade their mac users as it has the best Windows Network interoperability of any Mac OS. -Paul