The following does not occur when the page first loads, but only later.
I describe the creation of a game tree which works fine at first:

1. Create a binary tree with two levels (root = level 0) and 7 nodes:
   
2. Assign the root to player 1, and the two nodes on level 1 to player 2:
   
3. Click on "create information sets" (the link sign). Now move names and payoffs appear,
   
4. and player 2's nodes can be merged by multiaction into an info set:
   
5. Now start over, not by reloading the page, but by creating a new game on the very left:
   
   Bug: when you now go through steps 1 and 2, which work fine, it gets stuck at 3: the selection of info sets does not show the move names, nor can info sets be created as in 4.