Log4OM

I can get Log4OM to work with my Yaesu 991a.
I can get SDRPlayh to work with my Yaesu 991a.
I cannot get them to work at the same time on the same system.

For some reason when one is started before the other, the second program fails to see the radio.
What is locking out the COM port?

Whitch CAT system are you using ? Omnirig or Hamlib ? Hamlib does not have multithreading
like Omnirig has and if you connect via Omnirig all softwares (Omnirig, Log4OM, SDRplay
e.g. must be run as Administrator.

Omnirig.
Since posting this, I started experimenting. Once I started all three layers (SDRPlay, OmniRig, Log4OM) WITHOUT starting them as admin (as I had configured my old system), things started working as expected.

It's now working.