Hello David,

I was able to narrow down the error. It only happens to me with Windows 10.
The COM interface works once after switching on the device, then the error message appears.
On my other PC with Windows 11 everything works fine.
Maybe this information will help you.

Thank you for your prompt reply.
Unfortunately the test build has the same error.

Since the last update I've got this error under Windows 10

I've tried it as adminstrator - same error.