This issue happened for me for the first time today, after 3 years of use on my mac and also running Mavericks for months now. The one "new thing" I did yesterday was update Firefox.
I also found this right before the NVDA errors:
12/10/13 8:50:46.262 PM nobody: Flash Player Install: Installing Flash Player to /
12/10/13 8:50:46.266 PM nobody: Flash Player Install: Performing downgrade prevention check...
12/10/13 8:50:46.479 PM nobody: Flash Player Install: Downgrade prevention check passed.
12/10/13 8:50:46.814 PM nobody: Flash Player Install: Launching SAU Daemon...
12/10/13 8:50:46.876 PM nobody: Flash Player Install: Finalizing Plugin installation...
That happened while I was away from my computer.
The problem kept coming back and disappear again. At one point it rendered the MacBook useless. Couldn't even start it anymore.
I paid about 150€ to have the graphics chip replaced. Works like a charm, no problems anymore. And with Mavericks, I might actually be able to use this early 2008 MacBook Pro for another 2 years or so.
It has solved the problem for me.
I got it on ebay, which obviously only makes sense, if you live in Germany. On the description it says, that they actually replace the graphics chip with a newer version that doesn't have the problem.
Apologies for my desperate attempt to revive an old thread. My MacPro 1,1 cannot boot up via the normal sequence only to Safe Mode. I have done a fresh install of Snow Leopard, but I always get the grey screen and spinning wheel of death when I try startup.
Logging into Safe Mode then going to the console log I have noticed lots of these:
kernel: NVDA(OpenGL): Channel exception! exception type = 0x2 = Fifo: SW Method Error
Could my graphics card (NVIDA 7300 GT) be at fault here?