Is the slide release bar under the front of the seat not working? After you pull the release on top of the seat and the seat flops forward, pull up on the bar under the front of the seat to move it forward. If that doesn't work, something with the cable may be an issue.
Just got back from a trip to Black Forest Off-Road Park in East Stroudsburg, PA with the Tri-State Broncos club. Great time!! Great guys running this operation.