I guess as long as there comes no smoke out of the case there should be no problem. What happens if you connect the monitor to the scandoubler instead of the CV3D ?
In CGX there is a variable that switches off any monitorswitchers, so maybe the scandoubler works just fine the CV3D just doesn`t switch to it.
The variable should be something like NOPASSTHROUGH
What Amiga do you use the card in ? The scandoublermodule is quite picky. I only runs flawless in an A4000. I doesn`t play all to well with A3000 and some 3rd party A4000 busboard videoslots.
