First off: Hello, I'm new here, nice to meet you all! Loving Krita.

Now, as of late (in more recent versions) I have been getting these strange white "holes" that appear in the image. I can best describe them as someone taking a square brush and using it to make a big pixelated splotch on the screen. Closing and re-opening Krita resolves this, but they can appear after (as of 2.9.10) 30 minutes of usage. In earlier versions (I think as of 2.9,7) I'd get the holes after leaving Krita running for a really long time. Now they seem to be happening more frequently as of 2.9.10. My video card seems fine, as games do not seem to exhibit any artifacts after prolonged gaming sessions.

Is anyone else experiencing this issue (Which would consequently have me file a bug report and be at ease that my video card is not on the fritz)?

Well, I'm afraid that this still must be something with your video card/driver. It's caused by the driver dumping textures out of gpu memory because it's getting out of memory. If you disable opengl, it shouldn't happen. We can try to debug it and maybe workaround, but that would be something for 3.0 where the opengl code has been rewritten anyway,

That your games work isn't really relevant, the way games and krita use opengl is completely different.

Oh -- and does it make a difference which scaling method you set in the display page of the settings dialog?

I'll have to test it out, as I just stuck with the default scaling mode. It seems to be random, but I'll cycle through scaling modes each time it happens. I'll also try updating these drivers to see if it alleviates the issue.

Could you also potentially take a screenshot of the issue when it happens, I'm curious how these splotches look

Nim wrote:Could you also potentially take a screenshot of the issue when it happens, I'm curious how these splotches look

Sure thing. It tends to be random (from 30 minutes to a few days) but I'll definitely send them your way.

Hi Wontoon,

I think I'm experiencing the same thing or something similar. Turning off open GL doesn't fix it. It's random and appears like large parts of the brushstroke are missing - the missing parts are white and irregular with a gauze like texture. The one time it happened I was able to undo the brushstroke and repeat with a normal one. But recently I used the circle fill brush without any tweaks and every stroke was like this. The color was translucent and the overlapping strokes could be seen. Each stroke had countless little white flecks in it. A restart of Krita didn't change it, but after restarting the computer the brush behavior was normal again.

Intel Core i7-6700HQ 2.6GHz / 16 GB RAM / Windows 10 - 64 bit / Nvidia GeForce GTX 960M

boudewijn wrote:Oh -- and does it make a difference which scaling method you set in the display page of the settings dialog?

Update!

Okay! So, I managed to get that bug that appeared when a piece of the picture appears "missing". I've actually had it appear twice (the first time I forgot to screenshot it), but this time I managed to snag it. Sadly it's somewhat harder to see this time around as the image does not have a colored background, but it's there. The splotches seem to be different based on scaling mode used as both times in "Nearest Neighbor" I've gotten squares.

https://dl.dropboxusercontent.com/u/11802753/chunksmissing.png

I also made a stroke there. The data (thankfully) is still there, but it looks like a chunk was taken out of the image.

I think this one is already in bugzilla -- Tyson Tan reported it. It's really, really hard to track down and debug because, as developers, we usually don't spend several hours painting...