[ DD 1.9.0. 6.4 Beta ] Heretic E5M2 Broken
OS: Windows XP SP2
LEVEL: Heretic: Shadow of the Serpent Riders E5M2 [The Stagnant Demesne - Rapids ]
PROBLEM: You cannot move up any of the rapids
To re-create the problem:
1) Attempt to move up the rapids to the right of where you begin this level to retrieve any objects there (you will not be able to.)
2) Next, go down the rapids in the tunnel to the left of the yellow door (where the yellow key is located.)
3) At the bottom of this set of rapids you will find that you can no longer go back up the rapids where you just came from nor can you move
up the rapids to the right (where the switch for the elevator for the yellow key is located.) You're stuck!
NOTE: I warped to and tested this level on an old version of the Doomsday Engine (version 1.5.5) and it works fine.