I did exactly what you said and still no luck, this is what I have done so far and what I have currently installed etc. :
Done so far:
uninstalled all L2Walker components
fixed Lineage 2 via L2 CD (The Repair option)
reinstalled C3 (takes forever so it pissed me off when it didnt work after this)
Currently Installed Components:
L2Walker/TCPtunnel/PortForward activated
Switched protocol version on USA server to 555 in set.ini file
Lineage 2 w/ C3 Update (Didnt touch anything in the actual Lineage II folder)
...After all this being done I still cant log on to my account
