No zero possible in .fill in the blank. ?

Hi Ben,Sorry, I hoped it was a common problem but i'll give some more information:The control option is a button with two actions: the first action sais: show a textfield ("Well done"), condition 'question is correct'. Second action: show another textfield ("your answer is wrong, it should be 0"), condition 'question is incorrect'. The questions are not in a test. I use the checkoption of the "Fill in the blank" question by defining the possible correct answer. No other actions are used, just the simple question itself. No actions on the select/change tab. You could test it by making a simple 'fill in the blank' question and fill in 0 at the field 'possible correct answers. Hope you have time to do that for me...