If you create a simple level, such as the one published on the steam workshop to friends and admins, ATEST33BETA A, and use the Project Manager Publish to desktop, the game will run but no weapon will be held by the FPSPlayer. Also if you add a weapon from the FPS Player pack, into the level, you can not pickup the weapon.
If you run from the leadwerks editor the game runs correctly.
This was created using the latest beta version of Leadwerks 3.3 with the publish to steam fix to display the initial weapon.
if you empty data.zip or delete it, and copy the project folders into the published desktop folder, the game works correctly.