DVD STP - GPRM Based Button to Loop point trouble

First of all, I'm running DVD Studio Pro 4.2.1 on OS X 10.4.11

I'm trying to finish a project where when a video ends, it jumps back to the menu directly to the next button in order. This menu also has a loop point set in order to skip an opening animation. So I wrote the following script to accomplish this:

1: mov GPRM 0, SPRM 8
2: div GPRM0, 1024
3: jump "menu name"(Loop) GPRM 0

When I simulate the disc, everything works fine. However, a burned disc fails to return to the loop point. It will start on the next button when the highlights appear at the loop point, but the menu will begin from the beginning animation, not at the loop point.

Is there some conflict between the GPRM based button command and the start at loop point command? I did perform a test with the GPRM based button commands left out and the start at loop point function worked perfectly.