1. With Toad closed, back up this folder:
C:\Users\<usernme>\AppData\Roaming\Quest Software\Toad Data Point (version x.x)
2. Reset the user settings folder by launching Toad. A new setting folder will be created.
3. Close Toad again.
4. Go back to above path and move connections.xml file from the backed up folder into the newly created folder.
Launch Toad again.
5. Test and confirm that the Cross query window launches.