For those of you following this thread, I have found a fix which I hope may work for you. Simply uninstall Omnirig and reinstall. Now works fine. I have no idea what was causing the issue in the first place, but all ok now. Hope it works for you. 73 Geoff.

Hi Irad. Running as admin doesn't work. Can't attach log file, get a message saying file not uploaded. New .exe file doesn't work either I'm sorry to say. 73 Geoff.

Hi Irad. Sorry to say this updated fix does not work. By the way running as administrator didn't work either. 73 Geoff.

Hi again. I have it working Dave. I created a com port splitter, in my case com 19 (the rig port) to com 3 (virtual port). Pointed Varac and Omnirig to com 3 and all works. Log4OM 2 works too. Make sure you set the baud rate to match what you have in Omnirig and Varac. I use 115200. I used VSPE because I had it anyway for my Flex 5000A so just created a new device. I expect you could use any com port prog. Give it a go and I should be pleased to know how you get on. 73 Geoff.

Hi Dave. Thanks for replying. The IC-7610 does have 2 com ports but only one can be used for cat, the other one is for usb keying and is used for rtty or cw so that's no good sadly. What I may try is to split the com port using vspe and point the rig and vara to that and see what happens, but it would be better if the omnirig option worked. 73 Geoff.

I have this issue with omnirig v1.2, value cannot be null etc. Using IC-7610 and CAT control works fine, switch to omnirig error message pops up. No other programs running and omnirig works fine for wsjt and Log4om2. Ideas why this happens please? I want to use omnirig so I can use Log40m. 73 Geoff.