To try and resolve this issue, try verifying the application through Impulse.  If you need to, you may download Impulse here:

http://www.impulsedriven.com/impulse_setup_full.exe

Once Impulse is installed it will give you the option to create a Stardock.net account if you haven't already.  If you already have an account, but forgot the password, Impulse also will give you the option to retrieve your account information.

To verify the application through Impulse:

-Launch Impulse.  Right click on the entry for the application and choose "Verify Installation"
-Impulse will check the integrity of the installed application.  You should be given feedback as to the state of the installed application.
-If errors are found, an update should be made available in Impulse.  This is not an update to a newer version, but simply Impulse using the update mechanism to replace corrupted files.
-Once the update completes, reboot your PC.

If an uninstall/reinstall doesn't help, give [email protected] a shout, though the user switching thing does make me think a reinstall will help.