This is two different but similar bug reports.
1. When a warp anomaly appears, the little description that pops up blocks mouse inputs. This results in almost the entire area below your inquisitor (basically the bottom 5th of the screen) to be unusable for the purposes of movement or attacking. Trying to walk "south" of your character is very difficult until the anomaly notification disappears.
2. The popup warp anomaly descriptions appear to be completely absent in multiplayer for all players.