Bentley.lictransmit for windows has stopped working

Hi All

This problem popped up recently on a couple of my machines.  I now have about 10 machines suffering the same problems.  

On opening Microstation V8i, Ver users are getting: "Bentley.lictransmit for windows has stopped working" with the choices of "Check online for a solution and close the program" or "Close the program".

If a user chooses "Close the program" MS carries on working without issue.  This error can then pop up at any point while using MS.

I've deleted the c:\ProgramData\Bentley\Licensing\license.db file, but this has not resolved the error as it does with other licensing problems. 

All the log files show nothing unusual.

Any ideas?