When I hover my crosshair over the soul rift block, it shows an icon for entering it regardless of if I am dissociated or not.

When I click it, nothing happens (in either form). (I tried it both as part of an active obelisk and on its own).

Also, question, will it work trans-dimensionally? (e.g. between an obelisk in the nether and in the overworld)? Because in the screenshots I only noticed they were only identified by X/Y/Z co-ords.

My mods folder:

Afaik it does not work across dimensions. Assuming you do not have Attrition 4 I think one explanation might be a bug I encountered earlier, try putting the Rift as the bottom rune or in a seperate Obelisk and make sure you have enough soul blocks!

The icon showing whether you are dissociated or not is a bug, will be fixed in next beta. For the rest, refer to xiri's answers.

Rifts issues should be fixed now.