HumaDracobane

The problem is rather "simple". When I hover the mouse, not the cross in the middle of the screen, over an object the window with the information about the object (Name, durability, etc) doesn't appear at all. Looks to be a problem in my server since in singleplayer the problem doesn't appear. Does anyone know what might cause the problem? In the image my mouse is over the bronze arrow, but in the image doesn't appear. Thank you in advance. Edit: And, suddenly and for no reason, it works now. I just let the game open, logged in the server and went to do some shit. 40 minutes later it works...