I recently purchased a new iMac running Mavericks (OS 10.9.4). The game runs beautifully on ultra-high settings on older content but has serious problems in East Rohan (Please note that I have not advanced to Helm's Deep and beyond). I am experiencing frequently crashes (from every few seconds to about every 5 minutes); they do not appear to be related to any type of activity, such as mounted combat. The error that I receive when the game crashes is:
GAME ERROR  The game client was passed invalid command-line parameters [PlatformStringID_MustRunFromLa uncher]
I'm assuming that these crashes are related to Mavericks because the game runs very well on my laptop, which has Mountain Lion (OS 10.8.5). I'd appreciate any input or suggestions.
Here's more information on my computers:
2014 iMac 27"
Mavericks (OS 10.9.4)
3.5 GHz Intel Core i7
32 GB 1600 MHz DDR3 RAM
NIVIDIA GeForce GTX 780M 4096 MB
2013 Mac Pro 15"
Mountain Lion (OS 10.8.5)
2.7 GHz Intel Core i7
16 GB 1600 MHz DDR3
NIVIDIA GeForce GT 650M 1024 MB