Core FTP

I recently bought CoreFTP Server. I made the domain and 3 user account. Out of the 3 accounts only 1 will work, the other 2 get "ERROR:> Invalid username or password reported by server.". I have tried 3 different clients, delete and remade accounts but still only that 1 user/pass combo will work. I am using SFTP mode.

Thanks

Edit: I tried to make a second domain and set it to SSL Direct but everytime i upload a file it says it has encountered an error and may become unstable

The problem seems to be the 64 bit version of window server 2003 I am running. Oh well, I need to reinstall anyway. I guess I will just put the 32bit on.