Cant change info or shutdown devices?

Hello all,

We currently have around 600 Wyse C10LE devices in our estate, we had WDM 4.8 installed on it own server. Shutting down clients or changing device info never worked on this, it was a low priority for us and it got left for a while. I upgraded to WDM 4.9.1 last week in the hope it would fix the issue but it still remains. If i choose shutdown/restart/WOL nothing happens to the device. the tasks are sat in 'real time commands' so they have been sent.

Ive also noticed that i cant change any device info eg add a location or change the device name. the box comes up and i add the info but when i click ok nothing changes. i have tried 'refresh device info'

the device i was testing with is next to me and it reported in 3 minutes before i attempted to shut it down. the WDM server is on the domain with the domain firewall turned off. Remote shadowing works fine. my account shows as an 'administrator' account in WDM.

I cant really think of what to check, do any of you have any ideas?

EDIT: it is WDM 4.9.1 workgroup edition we use