Quartus II 10.1 web edition dropped support for Virtual Pins, it seems

Well, it's kind of strange. I have a design which has lots of virtual pins, which compiles fine on 9.1sp2; but when I load it in 10.1, even though it *recognises* the virtual pin assignments in the editor, I get a warning during compilation that virtual IO will only be enabled in the subscription version, and when I compile I end up with an error saying that it is missing 133 output pins to accomodate for all the pins I'm trying to use (which were supposed to be virtual pins of course, but didn't register as such, apparently).