[epearson]

I noticed that when a custom action is invoked, it is on an MTA thread.

In my case, I was writing a C# custom action that used Installshield automation COM objects. Being on an MTA thread caused library loading problems which was very difficult to diagnose, and was solved when I executed my actual build logic on a new STA thread.

So, it would be nice in future versions of VBP if the thread that invokes custom actions could be an STA thread to provide a better environment for using COM interop.

For me, of course right now I can just do the new thread thing each time.