@PShooter Hi. I’m afraid, we have not been able to find a way to reproduce this in the few years that this started to happen. The only pattern we’ve found is that it’s linked to CTH and some Cintiq wacom tablet models, as well as MacOS 10.11 and under which unfortunately for Apple themselves are considered legacy versions by now.
This legacy status also affects the foundation technology Pencil2D uses for handling input, graphics and more (Qt Framework) because they are forced to deprecate macOS versions at the same rate Apples deprecates them (since they are the ones that supply them with the bridge tech to develop for macOS in the first place)
So, what i’m trying to say is that, we will surely look into it, but we’ve had this issue ever since Apple started deprecating “snow leopard” (10.6) and your version “el capitan” (10.11) has been no exception to this problem.
At this point, If @scribblemaniac or any other developer is available to look into it, I’d like to ask if you’re willing to test future development builds aimed at legacy macOS versions with their help to see if it’s possible to fix this since none of us have an older macOS version to test.
Considering that newer versions of Qt framework bring fixes and changes to the input handling, we are in a bit of a tough spot since at some point we too will be forced to deprecate most versions of macOS support, or at least that’s my impression.
Of course I’m saying all this by myself right now, but let’s wait for them to chime in to let us know if this is something that is possible for them to look into or if it’s simply a lost battle.
In case of the latter i’ll gladly recommend some alternative programs so you can at least continue animating while having minimal issues.