It is not possible to add a lookup field criteria

It is not possible to add a lookup field criteria

ZC team,

If you are using the drag and drop interface and you need to add a criteria to a lookup field, it's not possible, because the text box for criteria suddenly disappears if you try to put the mouse cursor into it. So, an existing basic functionality is broken. I hope that you'll fix it soon.

This happens both in FF 3.6 and IE 8.

Regards,
George