The map and people dissapear

This has been a ongoing thing in my server everyone will dissapear and so will all the map props for my server. I have had people say this is a particle error something to do with color mater and inflater tool.

No, everyone on my server gets this.

Update your CSS, HL2, HL2ep1&2 and TF2 Content…

The server is only a week old I doubt there has been a update.

Idk than :confused: