I know I can click through the gears without the engine running. The problem is that the transmission will not disengage when I pull in the clutch. I have the cables adjusted properly.
What about the Clutch itself? Have you adjusted the Clutch? The first step would be to back off the cable adjustments, adjust the clutch, make the lower adjustment on the cable and then the adjustment at the lever. Have you tried that? Just going through the steps to see if you might have accidentally missed anything.
If the adjustment isn't the problem and the plates are stuck, I'd put the bike on the centerstand, get it started (when you can) and run it on the centerstand, with the clutch lever pulled in, to see if it might break loose. I really wouldn't suggest trying to ride it and try to break it loose that way.
Keep us posted as to what you come up with, okay?
You may end up going into it, but maybe not.
Later on, Bill