Different catastrophic error on export issue

[Tobe]

I have had this issues several times. Have been told to be sure to empty by temp file. It did happen once last week, but restarting fixed it until the next time. It also affects the ability to "undo" an action.

[John Lewis]

Im sure when i had this problem when i posted reply closer to the start of this thread. It was some time ago and if i remember restarting pc was the only way to fix it.
as you are running win 10 have you tried disabling fast startup well worth trying