yeah, deleting .ioftpd files solve this problem. I think this error occured because in my ioFTPD.ini was set as follow:
[VFS]
###
# Default attributes for files & directories
#
# Required Parameters: <filemode> <owner uid>:<owner gid>
#
Default_Directory_Attributes = 755 0:0
Default_File_Attributes = 644 0:0
and now I set with this:
Default_Directory_Attributes = 777 0:0
Default_File_Attributes = 666 0:0
This way new dirs work !
Tks for support EwarWoo !