Yes please post a schematic...
but keep this in mind, you must overcome the threshold voltage Vgs in order for the FET to conduct. So, first thing is to make sure that is happening. FETs that switch very fast may also draw significant gate current (due to Cdg charging/discharging) so don't assume the gate never draws more than pA. If driver circuit output impedance is too high, it may not be able to properly switch the FET. The driving impedance may also include your power supply. A calculation can determine roughly what drive current you'll need to provide on the gate without droping all your drive voltage (thus failing turn-on)
These are the two most common problems I see when FETs do not switch properly (other than wiring errors)