Did the engine turn over or did it just slip down?
If the engine didn't turn, then your clutch is slipping.
--
./luther
I know on my CB360 it will only kick start if the bike is in neutral and the clutch is engaged (clutch lever out).
Since the kickstart depends on the clutch, if the clutch is slipping from being worn or something, then your kickstart wont work either.
Besides not having resistance could you hear the engine turn over at all?