As I look through so many posts about unstable systems, it makes me wonder.
I haven't seen any posts from people with Radeon video cards. Admittedly, I'm an AMD and ATI user with several systems. Premiere is relatively stable on them. I can do hours worth of work before I need to save and restart.
So, I'm curious. Is it because I use Radeon video? or perhaps because I loaded Windows (Vista in this case) onto a blank hard drive instead of an update, or worse yet, onto something like an HP, Compaq, Dell, Sony etc, with all of its bloatware to confuse things.
I also realize that very few people with completely trouble free systems even come here.
But, if your system is stable, care to post and describe your system?
While the video card, and its drivers, can account for stability, much depends on the rest of the system, such as a strong CPU (especially for AVCHD), multiple physical HDD's, and a good compliment of RAM.
As far as video driver stability, until very recently, I would have said that nVidia went through a batch of drivers, that have caused issues. Just in the last two weeks, it seems that the very latest ATI/AMD Catalyst drivers might have issues too. There are several active threads on the PrPro forum, where users had to roll-back their Catalyst drivers. IIRC, the 10.3 seems to be the issue, and the late 9-series, and possibly the 10.1, work with Adobe programs. Seems that neither company is totally immune to problems.
Personally, I keep older drivers handy on my computer, though I have never had a problem with either of my nVidia cards, or their drivers. I still want the ability to go back to a "known good," should things go wrong.
It's the same for QT Player. The 7.4.x series of updates were bad with Adobe programs, and 7.5.5 is what I am using everywhere. The 7.6.x, before 7.6.6, also had issues with Adobe programs. I have not tried 7.6.6, though the reports are good. I'll wait, and probably pick up a copy of 7.6.6, in case I need to upgrade. Have no clue how well, or not, the next QT Player version will be. Time will tell.
Glad that things are going well on your systems.