I'm actually trying to figure out a fix for this - it's an issue if the game manages to detect very rapid double-clicks and confuses them for the click-and-drag behavior, and since the listened click-release has already happened, it never lets go. I'll hopefully fix it really soon!
Yes that sounds exactly like the bug I ran into. I have indeed been having issues with my touchpad double clicking very rapidly in the past. Hope you have the time to fix it sometime, but this also means that it's highly unlikely that many people are affected by the bug :)