damage

I've been using QC for about 7 months, and have had to restart my computer at least 25 times from QC crashing it, or rather me triggering crashes by putting in some value in a parameter that sends it over the top... However lately its seemingly worse. Sometimes it's triggered by simple things that wouldn't normally cause it to crash. Most recently while working with the OpenCL text extrusion composition. After a few crashes it wont even let me plug an image into the vertex displacement macro without crashing it. Upon restart and trying again I had some GUI glitching that didn't go away after closing quartz. By Crash I mean the computer. Have other users experienced much of this sort of thing?

Running a mid 09 macbook pro with the 9600M GT and 3.06GHz Processor. Some of this stuff really shouldn't be causing it to crash the computer. Especially when it didn't before..

Thoughts? Thanks