Hi!
I have not been using Krita a lot for a while, just now and then, mostly to play around to see what's new and such. When I saw that GDquest published some new brushes and I thought they looked nice, I decided to buy them. Krita has always, in my opinion, had poor brushes compared to other software. I have been using Photoshop a lot, ClipStudio (favourite), lately Affinity Photo and Designer (my new favourites). But Krita owns a place in my heart and I am willing to give it a serious try.

After installing the new brush bundle I was not able to do anything in Krita. It started. Yes. When I tried to paint on the canvas the pen got stuck there, I could not move it. After releasing the pen, it took about 1 second, then the paint showed up.

The program was totally unusable as you can understand.

I made a clean reset of Krita. Krita behaved the same.

All other graphic programs worked as they should. Something went wrong with Krita. Sorry. So I uninstalled it. Maybe I will reinstall it some other time to see what happens..?

Sounds like it's not related to gdquest's brushes -- but like you're also bitten by Intel's display driver bugs. Try disabling opengl to see if that helps; or disabling instant preview. If it doesn't we could investigate further... We currently haven't got hardware that exhibits the behaviour that you're describing so we cannot figure out workarounds. Oh wait, it's already too late, you uninstalled Krita already.

But waiting until it's different another time is not productive: how could an open source project possibly improve if all people act like that? We haven't got millions of euros or more behind us, like Clip Studio or Serif, or billions of euros like Photoshop. We cannot buy a lot of hardware, we cannot hire a lot of developers. Our budget currently is 60,000 euros a year! We're dependent on people being prepared to help out, and more and more, they aren't, and that is a big problem.

And "it was slow, I unstalled it, but PhotoPaintPlus worked fine!" is not useful feedback. Not if we haven't got access to your hardware so we can figure out why Krita runs fine on my lowest-model SP3 with win10 and not on your hardware.

I am sorry that Krita stopped working after installing the new brushes. As I said, I am sorry for it. I support Krita, now and then with some money. I know about Open Source. But I also like good solid software even if I have to pay a little. Like for Affinity. (I don't use Adobes products any more)

Since I use my computer and my graphic for my work as an illustrator for education books I have to rely on my software. I thought the new brushes would be something I could use in that work. But Krita stopped working exactly after installing the new brushes. Just before installing the new brushes Krita worked as usual.

I made the reset. I re installed. Krita still it did not work.

I will try doing the install on my Surface Pro and see what is happening. And it worked as it was supposed to do. What is the difference between the two computers? The pen input driver. Wacom vs. Ntrig

I got the idea to check out if there was a new Wacom driver. There was! I installed it, re started the system, re installed the GDquest brushes and... away! Everything worked just like before. I can use Krita again.

Here is my computer specs:
Win 10 Home 64 bits latest edition (a new upgrade just two days ago). Intel Core i5 3450 CPU 3,19 GHz, 16 Gb Ram. Nothing fancy, a 4 years old Win PC.

Ah, okay -- so it was the tablet driver after all. It seems that these days, most bugs I get on bugs.kde.org are actually bugs in tablet drivers. Heck, my own wacom device was completely broken until I reset the config, then broke again, until I reinstalled the wacom driver.