When using MultiInv if the Multiverse-Portals config option use_onmove is set to true you just swirl endlessly and nothing happens once you change it to false the portals work perfectly, however when you go through the portal MultiInv no longer manages inventory correctly its acting almost like it never knew you left that world.

If you use /mv tp to switch between worlds MultiInv works perfectly, its almost like the portals aren't firing the right evens for it to pick up on. Also i must add I've been using Transporter plugin for multiworlds and MultiInv works perfectly which makes me think its a Multiverse bug.

Please file a bug report similar to this one (Multiverse/Multiverse-Core#184 (comment)) with exact steps to reproduce. I'll have a look at it tomorrow mornin' when I wake up if it's posted then.

Ah, in the current builds, you need to restart when changing the on_move variable. This should be fixed in 2.1, but i'm gonna go do some more testing.

In the newer builds you can change this setting on the fly.

Fixed with this commit: bc86411