ZWO ASI1600MM-Cool Image Download Hanging

After over three weeks running SGP to control the ASi1600, with no problems t all, it has now stopped working. I have just wasted two hours trying everything I can think of and it will not work properly. I had down loaded the latest version of SGP V2.5.1.15 after my last imaging session,and the new ASCOM driver V1.0.2.8, and now my system is stuffed.
Basically, frame and focus does not work anymore, just downloads and never stops. I tried using short subs in a sequence and that doesn't work either. I am out of business. My cables are exactly as they were, I have changed nothing but this software. I have rebooted the laptop, tried difference connection secquences for the various devices, checked the device manager, reinstalled stuff, and nothing worked.
Can you SGP guys please fix this.