I am running an i7 iMac with an ATI Radeon HD 5750 GPU and 10.5.6 and this game has 2 modes....several windowed resolutions, and fullscreen, which is the 'short' resolution that Crossover reports, and no way that I see to fix it, so I run it in windowed mode.
The second issue is that when using the show folders option to bring up your personal music, the game crashes, presumably from looking for the files. If you hit the V key for using the Windows Browser, it will bring up a file browser and allow a song to be chosen. I store all of my media on a Drobo, and it even found it there. It doesn't support m4a files found on iTunes, so they will have to be a different format.