When I try to login with additional FTP account and then try to go into subdirectory, I am getting the error:
"550 the filename directory name or volume label syntax is incorrect"
- Microsoft Windows 2008/Vista software issue KB2305914
- File system corruption.Bug PPPM-1913 . It is fixed in Plesk 12 MU #29 and Plesk Onyx.
Install the latest microupdates or upgrade to the latest Plesk version .