Topaz Plug In window

I am trying to use Topaz remask in Photoshop. When I open it as a plug in, the plug in window is too large and I'm unable to finish the operations as the button is off the screen. This problem doesn't exist if I open Topaz on its own. It's it driving me nuts. I've Googled the problem with no joy. The button is there, but it's off screen