When one bit of code creates a dialogue, but doesn't show it, then another bit of code creates a dialogue and tries to show it - the M.core.dialogue can get them confused and the contents of one will overwrite the other.

This occurs with Atto on the Add a rubric page. The delete criterion confirm dialogue does not display because it's content gets inserted to the wrong dom node.

The problem is M.core.dialogue uses a COUNT variable to give each dialogue a unique id, but this fails sometimes, and gets reset to 0 - so there are 2 dialogues with COUNT == 0.

A quick hack is:

• COUNT++;
  + COUNT = Math.floor((Math.random()*10000)+1);

from js/dialgoue.js