OS-X afp usb problems

I have a My Book World Edition (1TB) on a network router wich works perfekt, the software is updatet, i can see these Station with my OS-X 10.9.2 in Finder and i’m happy.
Last week i need more Space and bought a My Book Desktop Storage (2TB) with a USB-3.0 and connect it with my first Station.

After a few seconds i can see these Space normaly in finder (using .afp).

Some files i can copy to the space (like .zip, jpg), some files i can’t copy (like xxxxxxx.php / files like Wordpress backups ). Some files i cant delete. 

I formatet these USB drive with the Software from My Book World Edition but it dosent help.

The finder talks about a failure -50  and the log of MB-World Edition says:

check_name: illegal name: ‘.AppleDouble’
Backup daemon.warn afpd[27263]: volume “usb1-1share1” does not support Extended Attributes, using ea:ad instead.

After three days searching for a solution i write to the community couse i cant find something,
could you help me?

Many thanks in advance

Did you try mapping the USB drive?

http://wdc.custhelp.com/app/answers/detail/a_id/2686