InfoPath Dev

I have a form developed with IP 2007 that is published to a SharePoint 2007 Enterprise Server.  I have digital signatures built into the form.  When opened with the IP 2007 client, and clicking to add a digital signature, this window opens correctly: However, when the same form is opened with IP 2010, I only get this part of the ...

Well, I did come up with a workaround.  I just made 10 copies of my Account Number drop-down (for 10 Departments), and ran each through the SP list for its respective Department.  I hid all copies except for the one for the selected Department.  Was there a better way to do this?

I am building an InfoPath 2007 form template for a purchase requisition form that will be filled out using the InfoPath client (not web-based). I have an "Account Number" drop-down list in which I have created an external lookup to a SharePoint 2007 list.  Here's my dilemma: The drop-down list is a list of account ...