title: How to troubleshoot why Excel disables an add-in?
body: <p>I've written an Microsoft Excel add-in in .NET using <a href="http://www.add-in-express.com" rel="noreferrer">Add-in Express</a>, and deployed it to about 50 different user sites, all running Office 2003 on Windows XP.  The add-in works fine at the majority of sites, but in a few cases, Excel seems to disable the add-in after a while, and they have to find it on the disabled items list to re-enable.  Re-enabling seems to take care of it, at least temporarily, though it's too soon to say if it will happen again.  So I'm trying to figure out why Excel is disabling the add-in, but all I'm looking for here is just a general method to find out why Excel disables an add-in.  In my situation, the add-in is running at remote sites, and I've had limited access to troubleshoot.  I did look in the event log and didn't spot anything.  I also have error logging in my add-in, and that hasn't caught anything.</p>
  
  <p>Any suggestions? </p>