Fusion 360 Freezes during start up

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When loading Fusion 360 it appears to freeze with a white box/failed loading element overlay. (see attached)
When loading Fusion: the splash screen appears, the sign in page prompt appears followed by the regular "Autodesk Fusion 360" title page appears. however the issue appears just as you expect the program to load.
The programs appears responsive and hasn't total crashed just frozen - hitting alt+f4 shows the program as expected briefly just before it closes completely.
It appears as if there is a incorrectly loaded element over the Autodesk Fusion 360" title page, Alt+F4 closes it and then the application follows.
The issue is affecting a large number of machines 30+ and has worked previously
Have tried/checked:
Event log shows nothing abnormal
Clearing the NMachineSpecificOptions.xml & LoginState.xml
Reinstalling the software does not resolve the issue
My only thought is the the element not loading is an online element and the traffic to it is being blocked.
Can someone also advise what URL's fusion calls to load or suggest something I haven't tried.
Regards
Bhav