The strange case of not responding to new licence code

After 3 good years the time has come for renewal.
However after receiving the new code I try to apply it and when I click ok it does nothing.

I get no error message and window fails to close. :-\ :-\ :‘( :’( :cry: >:( >:(

As I have tried this on three computers with the same result…

Has anyone else seen this behaviour?