With the latest patch 4.0.6 it caused the LFG queue to no longer show if a dungeon is in progress. Since I play a tank class this has completely caused me to stop running heroics. I started looking around for ways to get this done. It has been hell lately until I discovered this.
1. Be in an inn or main city. Somewhere that your character is resting.
2. Create a /camp or /logout macro.
3. Join the Queue.
4. When the Queue Pops immediately accept it.
5. a) If it is a dungeon in progress you should port right in as they were already inside when you accepted.
5. b) If you see people waiting to hit accept, press your Camp/Logout Macro and that instantly takes you out of the queue.
6. Log back in, if you were accepted to a new dungeon you will be able to re-queue.
Macro:
You can use either /camp or /logout
Read more...