I was only looking under Application event viewer before; there are no EoCApp crashes, just 2 seemingly identical information messages to the one above.
If I look under System, I have 2 of each of these (source of nvlddmkm):
The description for Event ID 13 from source nvlddmkm cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.
If the event originated on another computer, the display information had to be saved with the event.
The following information was included with the event:
\Device\Video48
Graphics Exception: MISSING_MACRO_DATA
and
The description for Event ID 13 from source nvlddmkm cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.
If the event originated on another computer, the display information had to be saved with the event.
The following information was included with the event:
\Device\Video48
Graphics Exception: ESR 0x404490=0x80000001
the message resource is present but the message is not found in the string/message table
Then a single warning:
Display driver nvlddmkm stopped responding and has successfully recovered.
I am continuing to experiment with driver versions, may try another clean install on an older one.