The only way you can arrange your groups at the moment is if you are level 5 or 6 in a group and then it will have the arrows next to that group.

To get all the group 6's at the top, you first have to send that group to the bottom of the list (clicking on the double down arrow) and then send it back to the top (click on the double up arrow). Use the double arrows, not the single ones.

When you join a group, that group seems to go to the top of the list so you then have to rearrange your groups again. *bummer* :-(

This is just a temporary solution until Jot works his magic.