Here at work we have our profiles, including our documents folders, remoted to the network. It’s a constant pain, and this morning the fun was how to get the CopySourceAsHTML visual studio Add-in working as a result, since its ‘normal’ install location, My Documents\Visual Studio 2008\AddIn’ is within that remoted profile.
Irrespective of fiddling around with CASPOL and security zones, Visual Studio seems intransigent in not wanting to load AddIns from network locations. Fortunately it turns out there are a number of different places that you can put add-ins to get them to load, which is probably better explained in this conversation.
As a result I dumped the addin into
C:\Documents and Settings\All Users\Application Data\Microsoft\VisualStudio\9.0\AddIns
…and it worked just fine.