GIMP Version: 2.8.14
Operating System: Windows
OS Version: win 10
GIMP Experience: New User

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Ok,so I have parblo A610 graphic tablet-and the pressure opacity doesn't work in gimp.I really totally frustrated,tried already everything possible:I installed the most updated driver for windows 10 from parblo site.I entered preferences->input devices->configure extended devices->I tried to play with the settings there in every possible way.If the pen is in screen mode it doesn't work at all-the pen becomes like move tool .when it's in disabled mode it works but without pressure opacity even that the brush is set to dynamics pressure opacity.
When i tried in Photoshop-there were no problems at all-works perfect.I even tried in inkscape and the opacity works there also,the only difference I saw is that inkscape recognizes the tablet and the pen-but gimp recognizes only the pen .So I don't know maybe I missed something....so if someone has suggestions or experienced the same issue I'll be very grateful for your help.

Hi alin32,

Same tablet -Parblo A610- and same problem.
Communication from the driver (x64) and Gimp (x64) are not very good.
I tried the "original driver" from Ugee M708, it seems more advanced but still no compliant with the Parblo A610.

Well, i tried to use alternative open software like Krita and depending on my 2 screens configuration, it works well.
Screens side by side work fine. Screens one above the other not work at all.

Do not test what i saw on other forum with the (x32) release of Gimp and Driver.....but common, we are in 2017 ;-)

So, if you don't want to waste your time - until a fix will be found - Watcom graphic tablet seems more reliable with Gimp.