Okay, I’ve heard back from Huion. Here’s their reply:
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Random lines - there are several causes for this such as the driver or the pen. We would normally try to let the customers use their tablets without the driver. If the issue doesn’t appear without the driver, then they can just reinstall the driver. But if it’s still the same without the driver and even in other drawing programs aside from Krita, it is possible that the pen is broken.
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Vague problems with press keys - our tablets’ press keys have been tested to work on moving the canvas in Krita. If the driver consistently show “Device connected” (see the lower left corner of the image in #3 below), then it is expected that the press key will work, unless it is a hardware problem.
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Wintab vs Win Ink Protocol - our drivers are not always in Wintab protocol. When users enable the Windows Ink option in our driver, it uses the Windows Ink protocol. On the other hand, if it is disabled, it will use the Wintab protocol.
