Few simulation problems with Quartus II 7.1 SP1

Driving the reset signal to the wrong value would not cause the outputs to go unkown(X), it would just cause them to reset. (The documentation should state what the reset is, but unless the name has an _n, or rstn, or something like that to indicate a negative polarity, I believe the general assumption is that it will be positive logic, i.e. 1 will reset the device...)

Looking at your previous post, you do get a warning that some outputs cannot be shown because registers that drive them are synthesized away. Are only some of your outputs X(which would be explained by this), or all of them(which would be explained by not driving a control signal).