I think something is wrong with the latest steam update for leadwerks. I'm using the beta.
When I look in the Steam Library it shows Leadwerks Game Engine - 46%.
Unable to launch Leadwerks until update finishes, but it keeps downloading and then saying - UPDATE REQUIRED (NOT QUEUED) and then repeating , and scheduling a new time a new time for the current minute.
Will try a re-boot to see if this clears.