I've been using cPanel for half a decade, but always on 32-bit OSes. I just did my first install on 64-bit CentOS 5.2 and things went pretty well until the end, where it threw the error: "Could not install gcc, please check your package manager! at ./install line 488." ...and then dropped to the prompt. Not sure if the install was completely finished or not. I installed GCC it myself by doing a yum -y install gcc which seemed to work perfectly, so I don't know what the cPanel install script was whining about. Anyone else seen this (or any other odd errors) on a 64-bit install. I'm going to keep plugging away to see what else happens. I'd like to start using 64-bit on all my new machines but it really doesn't seem like it's ready for prime time yet. I don't have the time to deal with a bunch of missing stuff. Might just go with 32-bit PAE if this is going to be a big hassle.