When you exit VB IDE with VBdocman loaded, it freezes.
You probably use MZTools add-in along with VBdocman. MZTools causes conflicts with some other add-ins like VBdocman, if it is loaded another add-in that also does subclassing with the VB IDE, as MZTools does. In this case, add-ins should be unloaded in reverse order to restore properly the subclassed window procedures. Unfortunately, VB unloads add-ins in the same order that they were loaded, not in reverse order. So, if you have two add-ins that are loaded on startup and both do subclassing, you will get a GPF when unloading VB.
[OPTIONS] ... SubclassIDE=0
That line causes the MZTools add-in not subclassing the VB IDE. The side effect is that MZTools shortcuts will not work, but you can use the add-in through menus.
Taken from http://www.mztools.com/faq.htm.