What you've done is beyond me....never even attempted to have it running on anything but the C: drive.
I' no help there....making room on the C; Drive might be best. Find useless stuff to delete?
________
as a wild guess, the Switch Users complication could be some issue with your copying directories from C: to D.
or
perhaps is something that might happen if you have created separate User accounts in your computer for yourself in an administrator account....and also a separate user login for Guests, or other family users. IF any of those other accounts had opened TTX and not shut it down, your attempt to start up TTX in your own user account would cause a conflict. (I've never created separate logins on my own windows computer, so I wouldn't know if this would happen or not)
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
