InfoPath Dev

c#, try this:  string UserName = HttpContext.Current.User.Identity.Name.ToString();  

sharepoint 2003 does not support browser enabled forms.  Infopath forms services in MOSS 2007 does....

go to your Central Admin, under Application Management --> Manage Form Templates, click on the form name, you should see the menu.

after u uploaded your form, did u deactivate and reactivate?? 

make sure the control is itself not disabled by checking its properties....or that some condition disables it.

you can replicate the multi-select behavior by use a repeating table, then put your dropdown list inside the repeating table.  In the preview, you should see 'insert item' after the first dropdown.  click on 'insert item' will render another dropdown for you.  hope it helps, yanling

I just encountered the same problem.  Just found a solution too.  :) This happens when you choose 'Do nothing' on version upgrade. To make the fields selectable/editable, republish the form with the following options. Go to Tools -> Form Options -> Versioning -> On version upgrade, choose "Automatically upgrade ...