I had this issue as well.
Plausible cause… Current Blackmagic drivers (Decklink 5.8) can only support up to 3GB RAM per their Read Me doc – You have 4GB installed.
Remove 1 GB or 2 (remember to keep the RAM even and paired on each riser). Hopefully this will be addressed soon, as you (we) will have to take a performance hit to work within the 3rd-party driver’s current capabilities.
In my case, I noticed the kernel panics became more frequent as the timeline became more “complex” (ie more math) with needed renders for CC, motion effects, etc. I didn’t have this issue with just the raw footage. I finally gave up and pulled out two 1GB sticks… ouch!
Also check for the explanation of the kernel panics in your /Library/Logs and please post. Also you may want to make sure you do not have any bad RAM. Try “Rember.”
Best of luck and Happy Holidays!
Sutomo