Outlook 2007 Addin - LoadBehavior in registry always resets to 2

I know this has been asked before, but I've never found a solution to this. I created an Addin in Visual Studio for Outlook 2007. I created an Installer and copied the files and created the registry values. It installs perfectly on the developer computer and it uninstalls perfectly as well. But on the second computer, which is also Windows 7 32bit and Office 2007, the registry key LoadBehavior is always reset to 2 when Outlook opens. I edit it to say 3 and it just resets to 2 again. No error message or anything. This also happened on my computer at work.

Now, I did re开发者_Python百科ad something about this guy that tried installing Visual Studio on the computer and it would run just fine after. Made me think I need some other .NET library or something? Why does this happen and has anyone ever found a solution?

In my case this turned out to be caused by an issue in a license protection wrapper from a third-party vendor. The issue has apparently been fixed in more recent versions of that product (contact me in private if you need more details).

Also, watch out for message boxes shown during Outlook startup. Outlook is really sensitive to those and AFAICT it has only gotten worse with Outlook 2010, especially under Windows 7.

Also, see this question of mine for links to a MS blog entry about this.