cudaminer.exe --algo=scrypt:2048 -H 2 -C 0 -i 0 -l t22x20,t22x20 -m 1 -d 0,1 -L 0 -o stratum+tcp://us.bitcrush.info:3444 -u user.worker -p pass
-L 0 is not a legal argument. My validity checking is poor, so cudaminer doesn't complain.
-L 1 means "no lookup gap", but you might as well leave the option away, as -L 1 is the default.
Christian