Latest steam version, Mac OSX 10.7.5, Mac Pro (2012) 12-core, 3.46Ghz. Radeon HD5870 (with three monitors). Problem occurs with latest version from the Uber website, as well. I can't get it to load at all - launching from Steam will set my status to 'playing planetary annihilation' for about 3 seconds before dropping back to 'online' status. Double clicking from the finder, it doesn't even bounce - the dock resizes for about .2 seconds and then goes on as if nothing happened (perhaps because I have a ridiculous machine running from an SSD boot disk). Trying to run the "PA" executable from the MacOS folder after viewing package contents results in the attached crash log. *EDIT* - The only way I was able to get that crash log at all, was to delete 'steam.txt' from within the package contents. Replacing it by verifying game cache and trying to run the "PA" executable from within the MacOS folder just takes me to Steam, which then does nothing.