Dynamo hanging on "run". Working this morning but not now

I have been editing and running Dynamo routines all morning with no problem. In the afternoon, it appears that all my routines now just hang on “run”. I have uninstalled and reinstalled Civil 3d 2022 and this is still happening. In past I have had trouble with spreadsheet related nodes that require Microsoft Office to be reinstalled. (but that would highlight nodes in yellow, this is just hanging)
Any suggestions for a fix would be appreciated.

We need to see some graphs and dwg files to understand and fix what is going wrong.

Its now like you’re at the garage saying that your car suddenly stopped working without actually bringing your car with you.

Unless all my routines have somehow become corrupted, then it is something else. On running Dynamo I get the attached message. Spread sheets will open, but any drawing from the spread sheet stalls

message.xlsx (10.0 KB)