not necessarily looking there, look in C:\Cakewalk Content\SONAR Platinum\ProChannel Presets
there should be a folder in this directory with all your PC presets.
if it IS there, just for giggles, exit the project, plug in another mouse, restart sonar, test it with a new mouse.
if you have not done so already, do a system re boot. = turn your pc off, wait 10 seconds, restart your pc.
sometimes corrupt data is held in RAM, this clears the ram and lets you start off fresh.