This may occur when a user launches GlasPacLX. They will get a message with the header "Activation Code Required". Underneath the header is the wording "Please enter the activation code for custom features." If the enter key is typed, you will get a message saying "Invalid activation code entered. Application will exit."
The Ctrl key on the user's keyboard may be stuck. Try tapping both Ctrl keys several times to release the stuck key(s). Launch GlasPacLX again, and it should open successfully.