From the "Looping fix" discussion thread (http://forums.spiralknights.com/en/node/27843), I got the impression that the looping fix introduced one new rule: After you go solo, your party is restricted until you go down the elevator. Then you can invite anyone you want.

But there seems to be more to it - the original party is affected by the solo action as well. Last night my guild mates and I found out that when someone goes solo, the original party cannot refill the empty slot until next floor. (We had 1 person alone at terminal, 5 people waiting to join. We wanted to create two full parties at terminal)

I would like OOO to clearly spell out the rules of solo/kick/join/invite, so we can know for sure how things work and not get surprised.