I had the same error, the fix is here:
http://x10hosting.com/forums/free-hosting/126059-i-cant-login-my-cpanel-fris-mysql-isnt-working.html
Go to 'Remote MySQL', add these hosts in:
int.fris.x10hosting.com
69.175.6.94
Then on the page, if it says wrong username/password again, refresh it.