I recently got jBridge and it worked fine. Except when I tried to load
plugins which have no GUI. Supatrigga and mda f.ex.
All I could see was a frame with nothing in it.

So what to do ?
In the folder with my ORIGINAL plugins jBridge creates a file
when I load the plugin into my D.A.W.
This file can be opened in Notepad and it shows different settings
which can be changed.
0 means INactive and 1 means ACTIVE.
Scroll right down to the bottom of this file where you will find
a setting that says:
//Loads the plugin in GUIless mode ( for plugins that have no GUI, when used in a VST host that supports those ).
//You will not be able to access jBridge's options if you change this to 1 without editing the settings file and changing it back to 0
REPORT_NO_GUI 1
All I had to do was to change the 0 to a 1 and then reboot. Bingo

Plugin shows with GUI
BTW: I am on windows 7 64 and my D.A.W is MuLab UL
Hope it can help if you have the same problem