But if I use enders client I get username/password incorrect

Has anyone else encountered this problem, and what could be a possible solution? I am using the latest distribution of Ubuntu. And of course I want to use enders client because of the higher screen resolution

[EDIT: I have the linux version from mediashare but when I try to log in form there it returns with client is too old.

[2nd EDIT: My run.bat reads as follows>> java -Xms256m -Xmx512m -jar haven.jar sh.seatribe.se. My haven.jar is 856.5 KB., Thanks for any help.]