Okay I've been using Painter 12, and just today I've downloaded the Painter 2019 trial. When I use the scratchboard tool this happen:
See what the arrow is pointing at, for some reason when I do a stroke, sometimes that happened. It doesn't happen in painter 12 though. So is that a bug or some sort of new feature. If so, how do I turn it off or adjust it.
does this happen with a wacom tablet? what's your OS?
in my (brief) experience with painter 2019, its support of wacom tablet and its drivers has been very questionable, and your issue looks like something caused by a driver mishandling. there're no new features that could produce anything similar to that, it's a software bug.
I use an xp-pen, and my OS is win7. Sigh, if what you said is true then, this is going to be a nuisance as I pretty much use scratchboard tool all the time.
The odd thing with Painter is it's dependence on Wacom drivers/hardware- it does not always play nice with other pen/tablet hardware and drivers.
In 2019 they added some expanded Wacom tablet features, hence the possible difference with Painter 12.
Try switching Tablet choices under Preferences- may or may not make a difference. Lastly contact Corel Support, or xp-pen for the latest driver.
painter 2020 will be arriving around mid-June - mid July if corel sticks to their recent release schedule;
while they never acknowledge reported and logged issues in public, they likely will address the tablet quirks, seeing how all of them seem specific to painter 2019 (wacom actually published a new driver ahead of that version's release, and it still was a hot mess at the launch), and a lof of those bugs are cross-platform.
there's a very small chance a windows update, an xp pen driver update or the windows-specific tablet preferences might fix this, but I think upgrading now might be a bit unreasonable with a new version this close.