Hi,
When I use my trackpad and perform a three-finger click, it is recognized by BetterTouchTool, but it still doesn't "execute" the middle click. However, when I use a mouse and do the middle click directly, it works.
what are you using the middle click for?
The middle click action you have selected will quickly press and release the middle mouse button.
Oh, I just found out the problem is this app: Dory - App Switcher on the Mac App Store.
When I quit this app, it works again, but why can this app break the middle click action in BTT when it still works using the mouse with the "real" middle click?
real clicks are sent on a slightly lower level, if dory blocks middle clicks only at a specific level it might block BTT's.
However it's weird that it would do that. Is there maybe a setting for that?