Version 1.8.9-2.0.0-15 - Single Player
So when using teleposers for transportation, if the teleposer's destination is in an unloaded chunk it'll delete any mob going through it, and if a player goes through, the game locks up like below. Teleporting blocks works just fine though. Also if I exit and reload the world I am at my destination.

@Tombenpotter is looking at teleportation stuff so he can bring his Portal ritual from Sanguimancy into the base mod for 1.8. That should solve this issue, but we'll see.