IOTLink service shown as 'starting' and only LWT event gets posted to MQTT

I have IOTLink running on a few PCs and installed it on a further one this week. The issue on this one is that the windows service never gets past the 'starting' message.

Both IOTLinkService.exe andIOTLinkAgent.exe processes are running. The only meesage that gets posted to MQTT is the LWT even though all extensions are enabled.

All other PCs report performance metrics as expected.