EDIT: Darn LOL, I was beaten. 
Make sure that your interface is labeled correctly.
Example:
Code:
case 7629:{
p.frames.showInterface(p, 255);
p.frames.setString(p, "Guthix Renewal Potion Instructions", InterfaceID, 45);
p.frames.setString(p, "First, Take the Bucket of Water and use it on the Vial.", InterfaceID, 1);
p.frames.setString(p, "Then, use the Herb with the Water filled Vial.", InterfaceID, 2);
p.frames.setString(p, "After that is done, give back to my follower.", InterfaceID, 3);
p.frames.setString(p, "", InterfaceID, 4);
p.frames.setString(p, "All in All, Peace in Peace,", InterfaceID, 5);
p.frames.setString(p, "-Guthix, the Balanced.", InterfaceID, 6);
}
break;
Fixed Code:
Code:
case 7629:{
p.frames.showInterface(p, 255);
p.frames.setString(p, "Guthix Renewal Potion Instructions", 255, 45);
p.frames.setString(p, "First, Take the Bucket of Water and use it on the Vial.", 255, 1);
p.frames.setString(p, "Then, use the Herb with the Water filled Vial.", 255, 2);
p.frames.setString(p, "After that is done, give back to my follower.", 255, 3);
p.frames.setString(p, "", 255, 4);
p.frames.setString(p, "All in All, Peace in Peace,", 255, 5);
p.frames.setString(p, "-Guthix, the Balanced.", 255, 6);
}
break;