[Solved] Mouse clicks are off when button is used for drag scroll

[Joe Cool]

I was wondering why I couldn't middle click on enemies. When Drag Scroll is disabled I can. When Letterbox is disabled I also can.

Turns out the button used for drag scroll seems to offset all clicks about one square to the left on the battlescape (even for left mouse/moving). Is it only me or everyone?

More info:
Version: Extended+-3.10a-632549f-2018-05-09-win32
Letterboxed: on (this seems to fix it when off)
Battlescape Scale: 2x
Windowed 1776x1000
Grab mouse: off (doesn't seem to matter)

EDIT: switching to 1/3 display also seems to fix the offset

[Meridian]

you can either have middle click or drag scroll with middle button... not both

[Joe Cool]

Really? It works fine, it's coordinates are just offset under the conditions I described.