We used DriverChecker(newest version) and updated both the drivers and the firmware for our STT-8300M w/FW8G-STT today. All indications were that both updates were successful. Now we have a problem that we didn't have before. We have always had a problem with the guide chip intermittently losing the guide star for a couple of seconds. Rarely was that bad enough to abort the image, but it did happen sometimes. We are using CCDOPS, and had no problems before the update. We found a bright star in the imaging chip. Went to start guiding and no guide stars seen. We increased the exposure repeatedly all the way to 10 seconds. We did move the scope around looking for stars. We finally swapped chips and used both "Focus" & "Grab" with no success. All images with the guide chip looked basically like a dark frame, dark with noise. We finally hooked up our light box we use for flat fields. the main chip was blasted out to max, the guide chip was still dark. We changed from "internal" guide chip to "external", no change. Back to "internal", no change. These were still at 10 sec exposures. Suddenly, it started working. There were stars in the guide chip. We decided to go through the procedure from the FW8G-STT manual to adjust the position of the Pick-off Mirror and focus the guide chip. We got that done and locked down the Pick-off Mirror. We took another image using the guide chip, and it went back to dark w/noise. No stars, whereas before their were multiple stars in the image. We tried the light box again, still dark. All of the images using "Focus" & Grab" were dark w/a little noise (like a dark frame). Most of the "dual-chip" images were the same for the guide chip. The main chip always saw stars. But a few times, the "dual-chip" image was very strange. I saved one that I could send. The guide chip was totally black for about 90% of the bottom of the chip, with the top 10% "dark w/noise". Another problem we had was with the downloads. A few times, while downloading the image from the guide chip using "Grab" or ""dual-chip" , it would get extremely slow. This only happened when the guide chip was used. And it never happened in "Focus" or using the main chip alone. I don't know if the updates had anything to do with this. And I saw an earlier post from the beginning of 2015 about bad HDMI cables. We purchased the camera & filter wheel Dec 2014 and it was delivered Apr 2015. But have not had these problems until now. Like I said, I have the "dual-chip" image that I could send. It's FITS, and about 30Mb but can be converted. Also, I'm home now and don't have easy access to the camera & computer at our observatory. It would take a few days to try anything or get more info. I know on my home computer, I use CCDOPS Ver. 5.57 Build 3-NT. We try to keep the same version here and at our observatory, but I can't say for sure it is. I didn't think to check that before I left tonight. Thank You.