Error saving client configuration

I have connected 1 client (latest version) to CMS 1.7, no problems at all and it is working fine.

Now i have another client, same OS, same updates, same client version etc, connecting to the same CMS server, and i am getting the following errors:

Invalid Configuration Option from CMS [DownloadStartWindow]
Invalid Configuration Option from CMS [DownloadEndWindow]
Invalid Configuration Option from CMS [MaxLogFileUploads]

I can’t find the problem, any ideas?

That’s odd, so CMS is 1.7.8 and both players are also 1.7.8?

Could you go to Display Settings page -> edit display profile assigned to your device (Windows by default).
Just check if the download start/end window is set to 00:00 and click ‘Save’ button.

Then try to connect this player again.

Is this cloned windows installation? Did this second player appeared in CMS displays page awaiting administrator approval or did it went straight to active and ready to play? I added a new Player and it went straight to "Display is active and ready to start"? I'm using an imaged/cloned version of Windows and all my Players show up as the same display in the Xibo CMS?