Access violation stops JabWrapper

Reproduce the test setup that creates JavaAccessBridgeWrapper, then inspect jab_wrapper.py around WindowsAccessBridge loading and jab_utils.py:53-55 around pump_background, GetMessage, and DispatchMessage. Compare the stated Windows configuration with the failure and document or verify a fix that prevents the access violation during initialization.

When running setup for tests to init the JabWrapper, I am getting:

DEBUG    root:jab_wrapper.py:112 Loading WindowsAccessBridge
DEBUG    root:jab_wrapper.py:118 WindowsAccessBridge loaded succesfully
DEBUG    root:jab_utils.py:55 Dispatching msg=<cparam 'P' (0x0000018D35679CF0)>
DEBUG    root:jab_utils.py:55 Dispatching msg=<cparam 'P' (0x0000018D35679CF0)>
DEBUG    root:jab_utils.py:55 Dispatching msg=<cparam 'P' (0x0000018D35679CF0)>
DEBUG    root:jab_utils.py:55 Dispatching msg=<cparam 'P' (0x0000018D35679CF0)>
Windows fatal exception: access violation

Current thread 0x0000030c (most recent call first):
  File "C:\Users\Me\PycharmProjects\test_proj\utils\jab_utils.py", line 53 in pump_background

The offending line is "while GetMessage(message, 0, 0, 0) > 0" at:

    try:
        jab_wrapper = JavaAccessBridgeWrapper()
        pipe.put(jab_wrapper)
        message = byref(wintypes.MSG())
        while GetMessage(message, 0, 0, 0) > 0: 
            TranslateMessage(message)
            logging.debug("Dispatching msg={}".format(repr(message)))
            DispatchMessage(message)

I have enabled Access Bridge for Windows, referenced the dll as an env var, removed user prefs for accessibility at .accessibility.properties and made sure that jabswitch is enabled.

Any ideas?