30 Second timeout before opening and E-Stop button not clicking...

Trying to setup Probe Basic Lathe for use with an EMCO Compact 5 CNC lathe with my own electronics.
After the splash screen there is about a 30 second delay before the main GUI appears.
All looks okay, the tabs work but the E-Stop won't click...
Note: In AXIS the E-Stop is correctly asserted for the 7i96s, and the power button works to enable a 7i96s output.
I think it is a python thing, but don't know where to look.

$ qtpyvcp -i

QtPyVCP Info
Version: 5.1.0+14.gba8f741e

LinuxCNC Info
Version: 2.9.8

Qt Info
Qt Version: 5.15.8
Qt API: PyQt5
Qt API Version: 5.15.9

System Info
Description: Debian GNU/Linux 12 (bookworm)

Kernel: 6.1.0-30-rt-amd64
Version: #1 SMP PREEMPT_RT Debian 6.1.124-1 (2025-01-12)
Ram: 7 GB

CPU Info
Vendor ID: Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz
Architecture:
Physical Cores: 4
Logical Cores: 8

The last error message (whilst I was sorting out the copying of stuff into the .ini file - not getting any at present) had this:

Traceback File "/usr/lib/python3/dist-packages/qtpyvcp/plugins/notifications.py", in timerEvent error = self.error_channel.poll() ^^^^^^^^^^^^^^^^^^^^^^^^^ linuxcnc.error: Error buffer invalid

... not sure if any relevance.

How about the SIM, does the SIM start and work as expected? If so it's almost certainly a config setting issue.

This sounds like maybe an estop conflict. Or perhaps a post gui hal file issue.

Probe in Sim works okay... now comparing the various files.
Thanks for the suggestion.

Find the culprit?