Incompatible FTP?

[TCH]

If i connect via FTP to my OpenBSD server, then the following clients do the following:
- Linux's own FTP client: works perfectly.
- Total Commander via WINE: works perfectly.
- Krusader: connects, but displays nothing but the parent dir (except if i am in "/", so it actually knows where it is), navigation is possible by writing the path directly to the address bar.
- CurlFtpFS: connects, but only shows one dir with a locked file called "such file or directory". Yes, without the "no".

How is this possible? Is OpenBSD's FTP server working in some kind of "alternate" mode, which is not interpretable for Krusader and CurlFtpFS? Or do Krusader and CurlFtpFS simply have bad FTP client implementations?