To ensure the best possible play experience with the Guild Wars 2 Mac client, you should make sure that your operating system has been updated to the latest version. Currently, this means having Lion (10.7) updated to version 10.7.5 and Mountain Lion (10.8) updated to version 10.8.2.
To check what version of Mac OS X you are running, click on the Apple menu in the menu bar and select About This Mac.
If necessary, click on Software Updates… and follow the prompts to update your OS to the latest version.
(edited by Robert Walter.8130)