OK, I tried the following:
Uninstalled 2010 (and attempted to install 8.5, which you can't on Windows 7 apparently.
Re-formatted the new external drive to NTFS.
Re-installed the software. Ran updates (it needed none).
Ran thru initial wizard setup and allowed all defaults. (Backup C: and Recovery partition to Ext drive F:)
Ran first backup and received an error. (see below*)
I exited program. Re-started and re-ran. It completed backup successfully in 53 minutes; a 65GB recovery point was created.
I then ran the Documents backup and received the error:
Error e7b70005 running job: My Documents Backup
I re-ran the drive backup and it completed in about 2 minutes successfully.
So it seems the error is only from the "My Documents Backup."
Any suggestions??
** Initial error which never repeated, so I guess I'm not going to worry about it:
-Cannot create the recovery point.
--Error EBAB0013 A test that safeguards the integrity of the program failed unexpectedly. CHECK failed. Computer::CreateImageFile: .\Computer.cpp(1453): guid != Guid() && sequence ! - 0xdfffffff