NPC's are refusing to respond

[Torack]

My problem is that NPC's can't get highlighted, or selected if you prefer. I've tried clicking next to them, over them, basically all over. I even went and changed the graphic settings and nothing seems to be working. And I think it would be wise to mention here I'm a linux user and I downloaded the game from Desura.

[Minks]

Have you tried targetting items, such as the furnace? Maybe there is something wrong with your mouse configuration.
Until the problem is solved, you can work around it with the /target command. For example
/target Abelia should select Abelia, /target nextnpc (not sure) will target the next NPC. You can look up the exact commands in the ingame help (F1).

[BoevenF]

I had the same problem once. There was a key locking the targeting. I don't remember right now, maybe caps lock.

[LigH]

Sometimes it happened to me that I targeted something, and the marker appeared for only a fraction of a second, then went invisible. But the info window still displayed the title of the targeted item or NPC or character.

The command is: /target [self|clear|[prev|next] [item|npc|player|any]] (e.g.: "/target next item", "/target next npc", "/target next player", "/target clear")

It is useful to have shortcuts with keys assigned for such commands, so you can easily cycle through nearby targets.

[Eonwind]

be sure to update the client properly, there was a bug which was messing with window's position (and mouse control) and was fixed by a later update