I have a portal form (v6.6.1) with several mandatory fields. If I leave some of

I have a portal form (v6.6.1) with several mandatory fields. If I leave some of these fields without values the form flashes up some red validation messages very quickly but then submits the form anyway.
The forms designer shows the fields with the mandatory star and although the required options also show the mandatory status it is greyed out. There also seems to be a mismatch on the input parameters where only some fields are shown as mandatory.
I am using IE9 but am wondering if some of my settings could have corrupted the process model when I published it as the problem is appearing for some forms which i haven't changed.
Any answers greatly appreciated....

OriginalPostID-113544

OriginalPostID-113544