Timendainum

I run a small linux multiplayer server for my friends. One of our player has an issue where he can only target a jump once per day. I know it is weird. When you right click on the map and select "Enter coordinates into the Nav computer", it only functions for him once per day or so. Logging off, quitting, rebooting, reinstalling the game from steam, nothing seems to help. It is like selecting the option does nothing. The blue square highlight does not appear, and the message about computing the jump does not appear. Any ideas?