o I enter 0 and it adds a 5 when I hit OK
You always have to press Tab or Enter to leave an input field on AmigaOS, otherwise the input might not be taken.
The 5 probably was hidden under the cursor. Because of lack of different colors you didn't see it. You should have moved the cursor one position to the right to check if the field is empty before you enter something.
Bye,
Thomas
