OK… did some checking around. With driver 4.88 build 4, everything with the FW8-8300 worked fine. The driver you are using (build 9) released 3 days ago, dealt with CFW issues for STT cameras (that is the only item in the release notes). After updating to build 9, I can confiorm the FW8-8300 no longer responds. I cannot remember of there is a way to roll back SBIG drivers (the utility does not seem to allow for this). We will need to see what is going on with build 9.
I know at one point @joelshort dealt with some SBIG driver madness and daily swapping. He might have some insight on how to do this.
Do the other applications you connect in control the CFW or just connect to it like SGPro does? Also, did you take your logs down already? I wanted to look at a couple other items.