Note that this is a BETA version, please don't publicise!
Ensure that the System Preferences panel is CLOSED. Quit. Not running. Double-click the FinderPop.prefpane icon. System Preferences will
open and ask if you want to install FinderPop for all users or just you. Choose "All Users" and continue.
2.5.4 Beta fixes an Applescript launch issue (see nobio's bug here.)
It does this by using a modern LSOpenFromRefSpec() API instead of the ancient 1997-vintage LaunchApplication() code - this is the code that opens the Finder selection with whatever app you chose from the FinderPop menus.
Just in case... you can revert to using the old implementation using
defaults write com.finderpop.finderpop useCarbonLauncher true
The previous beta version of FinderPop is available here (2.5.3).
If you're installing this over a previous version of FinderPop, you'll have to restart or logout/login for it to take effect.
As usual, if there are any issues with this, reply here in the forum!