About MV2. Multiverse was created at the dawn of Bukkit multiworld support. It has since then grown into a complete world management solution including special treatment of your nether worlds with NetherPortals.. In the second delivery of Multiverse, we've broken it up into several smaller plugins that are each feature packed but *not bloated*!
Sometimes I walk into a Nether portal and it doesn't work. The screen gets all wavy, and then nothing happens. It just stays wavy. I don't change dimensions. This happens both ways, Nether to Overworld and Overworld to Nether. I do not have Multiverse installed.