Guild Wars 2

I don’t know what causes this bug it might be alt-tabbing. Anyway when I tab back in I won’t be able to left click npcs/enemies to target them. I will have to restart the client for it to function properly

I’ve had this happen too, and I also suspect it was alt-tabbing, although it doesn’t happen every time I alt-tab.

I have encountered this bug for a first time a while ago and I did not alt tab at all. This just happened during combat.
Can not left or right click , highlight, or select any object on the game field.
Clicking over user interface and dialog boxes or rotating camera still works.
Edit: Forgot to mention that I was playing with the rangers pet user interface at the time this happened. If it matter.