Okay... so today i was trying to create a portal from my two bases with a portal gun and the gun acted like it was shooting but a portal was not made.. i tried all of the variations of the gun as well and nothing. It worked before but now it does not. Now, this world has been recovered from a level.dat corruption if that makes a difference in the solution. However, i was just exploring a mystcraft world and i found a portal gun in a loot chest and i was curious so i used it and sure enough it shot a portal and i was able to create linked portals and jump through them without problem... so i think its only in the overworld. if anyone can help please be descriptive in the steps on how to solve it if you can, im not that good at solving problems with computer files yet... thanks a bunch!