Had a spot of bother.... tried to run a workflow with a macro in it but got the above error.

I have tried to open macro directly through file explorer and alteryx open dialogue to no avail. Just flashes error dialogue and then fails to open on clear.
Have tried dragging it on to a an empty new workflow tab, and it seems to open a tab, but wont display any of the tools or settings. Worse still as i try to close the other blank new workflow tab, it just iterates up a number with each close.eg new workflow2, new workflow 3 etc etc
Seems very wrong to me.
There have been no changes since last successful run, but it seems corrupted somehow. I have upgraded the version since. Coudl that be the issue.
Any help much appreciated.
many thanks
Dubya