When you add a comparision condition to an event,
eg,
objectA value greater or equal to 2
then click ok, then click on the number 2 as if you are going to quick edit it from the event sheet, rather than the wizard, but click on the condition whilst editing the value and bring up the comparision wizard, the top evaluation box is missing. If you click ok it's also missing now in the event and wont run. The condition has to be deleted and created again.
As of 0.98.8, cannot reproduce this bug.