Can't login with FTP only SFTP

Hi, I have creted a user account, when I try to FTP into the server I get this:

Cmd: USER david
331: Password required for david.
Cmd: PASS xxxxxxxx
530: Login incorrect.

However, as soon as I change to SFTP I can log-in. (I can also log-into DA with that password fine). At the same time I can FTP into the admin user no problems. This does not sound right, or am I missing something?

Thanks, David

Note that for any additional FTP accounts you create, the login is '[email protected]' not just 'david'.

'david' is the default account. I have tried '[email protected]', and I have also tried creating an additional ftp user 'test', still no luck.

An update on this problem. I have found out it only happens when I assign a "free" IP number to the user. If I delete the user and create them again under the "server" shared IP I can FTP fine. As soon as I create the user with a "owned" ip the username/password is not being accepted. Please note, there is no problem contacting the server, its the username/password that is being rejected, these attepts are written into the FTP log on the server. And it only affects FTP.
SSH, SFTP, DA login all work fine.

It turns out each time after creating a new user (with "owned" ip) restarting proftpd fixes the problem.

I'd bring this to the attention of DA support; proftpd should be restarted automatically every time you add a user.

Jeff