Marc,

Check out the MS Knowledge Base article at http://support.microsoft.com/support/kb/articles/q164/2/52.asp. It talks about 254 items, not 509, but it sounds like it might be the same problem.

>I have another problem working with a combo box. My combo box have 510 items in the drop down list. When I select item number 509 the combo box refreshed. I go back and select another item in the list, I get a error. The items from 1-508 is ok and any items above 509 is ok too. It just the item number 509. I don't know if you run across anything like this before. If you have and do have a work around that would be great. Thanks Jim.
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>Marc.