Walkthroughs for custom maps.

Guys, I need help! In the Jedi story map, the hero simply refuses to enter the orange monolith entrance. The horse icon just doesn't "rear up," as it usually does... and because of this, the entire walkthrough is stalled... Also, the same thing happens with the Sword of Justice artifact: the artifact is right in front of me, but I can't pick it up. Has anyone encountered similar bugs? Please help!