I used to run Ambience bridged (and also I always embedded UIs of every 32-bit plugin) and never had an issue with its UI displaying incorrectly (or any other bridged 32-bit plugin that I had used), on either of my Win 7 computers (different GPUs but both were Intel). I also tend to copy/move plugins a fair bit (the way you described), so I'd have noticed.
However in a previous version of Dragonfly, it seemed the spectrogram view initially showed up with a white block in the first 1/4 (left side) of that window. It displayed correctly as soon as I hit play though. And it doesn't do that anymore. (edit) Ooops spoke too soon, somehow I made it happen lol.
I was editing settings with it disabled in the fx chain, then opening/closing the window...who knows what made it happen. I was able to make it return to normal by closing/opening it a couple times though.