Blank Screen, caused by multi dropdownlist changes before page have time to post.

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Blank Screen, caused by multi dropdownlist changes before page have time to post. Howzit ! I have a event on a dropdownlist. After changing the dropdownlist selection and the post event kicks off any changes made on any other dropdownlist on the same page results in a white blank screen(This result don't always occurs). I have seen this problem on multiple sites and wonder if there is a possible solution. I have tried using javascript to disable the other dropdownlist but in certain instance it still occurs? Any help on this matter would be appreciated. Thanks :confused: Africa is a tough country --"Hello daar vir die Afrikaans sprekende"--