I had the same problem with my mousepointer not "gripping" right click and it would just slide to the side. This caused a lot of problems for me when doing i.e jump puzzles etc. I had recently configured a gamepad to use for games on my PC, and this seem to have an impact whenever it is plugged in. So my solution was just to umplug the gamepad whenever I play GW2 and restart the game and the problem would be resolved.
Mouse Cursor Problems (weak grip and/or cursor sliding)
in Account & Technical Support
Posted
I had the same problem with my mousepointer not "gripping" right click and it would just slide to the side. This caused a lot of problems for me when doing i.e jump puzzles etc. I had recently configured a gamepad to use for games on my PC, and this seem to have an impact whenever it is plugged in. So my solution was just to umplug the gamepad whenever I play GW2 and restart the game and the problem would be resolved.
Hope this helps.