Ok...
Gotta delete that sig.bin file and reauthenticate
1. Delete this file:
C:\Documents and Settings\All Users\Application Data\Stardock\Twilight\sig.bin
*** Note: Application Data is a nominally hidden folder, so you have to unhide it with folder options ***
2. Start TA (this will bring up the authenticate window)
3. Re-Authenticate with requested info
4. Enter Metaverse (You will not need to login if it works)
Good Luck
P.S. I'm printing this for my own future installs. hahahaha