The TH2 seems only active if I have the UI open for it.  The minute I close it out I have no effects.  This is the only plug in I have seen do this, ever.  I had to bounce the track down because I could not leave the TH2 UI open forever while working on the project.
 
Is there a way around this?

I have had trouble with Th2 as well but not the same problem you are having. You might try double checking the routing and turning th2 off and back on from the track to see if that helps.

Hey Tom -

Thanks for the reply and suggestions, the routing is pretty straight foward on this test project.  I closed the project and re-opened only to have the same issue with TH2.  Never seen a plug in that was only active with its window open. 

FWIW I am not seeing that behavior here either.

I haven't had that problem here. Mine still works with the window closed. I do have a problem with the presets. In the stand alone version there are way more banks and presets than in the VST version.