With multiple screen setups (Laptop where a docking station has a different screen size to the laptop), the version of DBAuthorise client we have used sometimes displayed the window off the screen.
If you can’t get the screen on your display (Shift right click the program in the task bar and click Move, or Restore and then Move followed by pressing the arrow keys), I normally remove the following registry key from the users registry:
[HKEY_CURRENT_USER\SOFTWARE\Version One\DbAuthorise\Settings\AuthView]

It is important to note this resides in HKEY_CURRENT_USER, running regedit or reg as another user will not touch the current users registry hive.

Using the following in a .reg file will remove the registry key, if your user has access to this
[-HKEY_CURRENT_USER\SOFTWARE\Version One\DbAuthorise\Settings\AuthView]

Using the below you can use the reg command line program, if your user has access to this
reg delete “HKEY_CURRENT_USER\SOFTWARE\Version One\DbAuthorise\Settings\AuthView”