>i think a way to reproduce this, also i believe this is not a bug.
>create a new form and add a combo, rowsourcetype=1 in combo init event: this.additem("one") this.additem("two") in the init event of the form write: thisform.combo1.value=' ' &&blank space then run the form
>the space is shown in the bottom of the combo.

Yes, exactly. However, it's not for every rowsourcetype, I believe. Thus inconsistence.