pyFldigi blocks normal operation of FLDIGI on Windows

[dB-SPL]

As soon as the client object is created, FLDIGI will no longer transmit text entered into the transmit pane or sent from FLAMP on the same machine. If FLDIGI's TxID feature is enabled, the RSID is sent, but no data follows it.

I'm not sure if the root cause lies with pyFldigi or FLDIGI itself, but the issue doesn't appear to affect the same Python script running on Linux. I haven't experienced the issue between FLAMP and FLDIGI on either OS. If FLDIGI were solely at fault, I would expect the same behavior from both pyFldigi and FLAMP.

The problem was observed with FLDIGI 4.1.16, 4.1.18, and 4.1.20 with pyFldigi 0.4 on Python 3.8 on Windows 10 Professional 64-bit, but not Raspberry Pi OS Buster with Python 3.7.