Hi Stephen, there is a problem in MorphOS 2.7 addressing more than 1280Mb (in PowerMac)
I have same freeze problem in PowerMac FW800 dual G4@1420 with 2048Mb RAM (512Mb x 4).
You can see also this freeze problem copying file in RAM: volume (more than 1280Mb).
I hope It' ll be solved this addressing RAM problem in MorphOS 2.8.
bye

[ Edited by Divinity 14.05.2011 - 21:29 ]