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Level 7

I know you posted this a long time ago. I happened to come across it today because I was having the same problem. I had a drop down list that worked great but when reader extended either on the server or in Acrobat 9 caused the items in the list to be duplicated.

The solution I got was to put on the Initialize event for the drop down list the following:

this.clearItems();

When I did this the form worked fine even after reader extending. I have no idea why this works but it does.