It's good to hear it was just an error on the application.
Now, for keeping your temperatures down, U may try the monitoring application from your MB software disc. I've got an Asus M2N68 AM Plus, and it came with Cool & Quiet, and PC Probe II.
Course I've not used any of my taxing design applications, but I've been working on a lot of stuff at the same time, no lockups/overheating at all: it drops the clock speed down in just a few moments if I stop going on and it's usually running on the sub 35's Celsius. So C&Q should help you to keep it power efficient and therefore on the lower temperatures whenever possible.