P25 Thin Client - Options / Resources aren't displayed

I'm new on WDM. I've installed version 5.7 (Workgroup edition) and tested it with some P25 Thin Clients we have at the office. The Thin Clients are correctly discovered by the software, but options like Shadow Remote and Send Message aren't displayed. This is a compatibility problem, isn't it?

Also, when I use WebIU and select a device, it doesn't show information like CPU/RAM usage, disk space, network or system data. What could be the problem?

Some captures:

i.imgbox.com/4Arf13kw.png
i.imgbox.com/JzHQZenZ.png
i.imgbox.com/aJjPVAfu.png
i.imgbox.com/j7AD4lK0.png

Thanks!