I've noticed this once after updating ProScan. The issue boiled down to the fact I run ProScan under a regular user account but the update routine requires and prompts for Administrator privileges. After the update routine completes, the installer prompts to "run ProScan" with that option selected by default. If you don't unselect that option the elevated installer will run ProScan in an elevated session which is not the same as running it as a regular user account so it will act like a fresh install. Bob can you set the installer to not default select "run ProScan" at the end of the install routine?