Where the heck is the emerald gate? I can't find it anywhere. 
Also, once the teleporters become inactive, you can get stuck in any zone, especially the ruby zone.
Have you tried taking the path below the red gate yet?
Anyway, tOLP 1.1 has been released! This fixes a number of issues:
Changelog for 1.1:Fixed a bug where all teleporters would become inactive.
The explosion script no longer repeats.
The end script is now guaranteed to work.
Changed some other small things in the end script.
Added some minor things.
Fixed a bug where you could get stuck in Test Of Platforms.
Fixed warp lines in Ribbon Chess
Fixed a tiling error in Ribbon Chess and Lost Code
Fixed a small text box alignment error.
Download it here:
http://www.mediafire.com/download/6646hejzoxi9c67/open_1.1.vvvvvvI can't update the first post here though...
If the teleporters are inactive (I found out why) and if you can't update, try touching the big round teleporter. It may fix the bug. Also after updating, you should go into the green area for a few rooms (you don't have to go all the way to the teleporter, just to the room before it, and then back) fixes the problem if you have it from 1.0 or 1.0.1. The bug won't activate at all when you play the level from the beginning in 1.1.