IQ spectrum mirrored on Duo

[srcejon]

I'm trying to use RSPTCPServer with a Duo (h/w reported as version 3). However, I'm seeing the real part of the spectrum mirrored on to the imaginary part of the spectrum:

This doesn't happen with other versions of rsp_tcp (https://github.com/ON5HB/rsp_tcp https://github.com/f4fhh/rsp_tcp) that use the older API (so I don't think it's a client problem).

I've tried multiple clients and see the same problem. Have tried the server on both Linux and Windows. Also, it doesn't matter if running in enhanced mode or whether 8 or 16-bit data is used.

Also, the LNA control doesn't seem to work. I can only get something that changes gain by adding some code to disable IQ correction (chParams->ctrlParams.dcOffset.IQenable = 1)

Any ideas what might be wrong?