Since I have gotten the new version with a pack of watercolor bundles. I have been experiencing this weird transparent marks exclusively on my canvas.
I have recently updated it to 4.4.8 and it still seems to have no improvement
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Hello and welcome to the forum @Ms.Crystal!
This looks like a UI scaling problem, you can try the setting suggested in the screenshot (you can find it under âSettingsâ >> âConfigure Kritaâ >> âGeneralâ in the âWindowâ-Tab), or with your operating system set the UI scaling to âevenâ values, so 100%, 200%. I think 150% would also work but values like 125% or 175% will cause such âphenomenaâ.
@All: If I am totally wrong, please correct me.
Michelist
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Hello! And thank you for your help and the warm welcome! Unfortunately both settings were already enabled so it didnât result in a greater result(the only one that wasnât enabled setting was the first one)
That is a pity! Well, wait a bit, I think there will be other users on the subject, and they may have tips that are not known to me. Since this is a very international forum, it occasionally takes a little time until the earth has turned to the right side and the users have time for the forum, are awake, are back from work 
Michelist
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Thank you for the kind words and Iâll definitely wait for the answer ^v^
While I can still use the canvas those transparent lines make the process distracting and hard on the eye
Why is your topic title about moving the pen around?
Does this happen while painting?
Did you make the Background layer that colour by specifying the colour in the Content tab of the âCreate new documentâ window, or did you start with a white background and flood fill it with colour?
Are they there as soon as you create a new image?
If you unlock the Background layer and paint on it, does that cover the marks?
If you paint on layer 1, does that cover the marks?
Hello! Iâll try answering everything in order:
It does happen while painting, those transparent lines show up if I move the cursor or use the pen
The background layer comes from the content tab/create new document
No, they arent. If I create a new layer pra use other commands outside canvas like using the scroll bar those white lines disappear, however they come back as soon as I move my cursor on the canvas(yes it happens with a mouse too)
I havenât tried it yet, Iâll check it out and update it here
No, it doesnât
I have the same issue on Linux (Manjaro with KDE), itâs not only the canvas though. I have gaps all over the UI where you can see through and see the windows in the background or the desktop.
It happens in the the brush presets test area too, there itâs even worse for me, sometimes to a degree that itâs unusable because you canât see anything but lines, it depends on the brushes.
I was able to identify UI scaling as the culprit, the only fix I know of is to turn it off, but then my Krita interface is too small on my 4k screens, too small to read anything without getting eye strain and too small to click anything without making it a test of accuracy and patience.
I confirmed this on multiple occasions when others reported it on this forum, I think I even filed a bug report but there doesnât seem to be any fix or anything other disabling system UI scaling.
And yes, the lines appear as you paint. Moving the cursor is fine, but as soon as you paint, the lines appear.
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@Ms.Crystal Which operating system are you using?
@Takiro The monitor used by Ms.Crystal is not a high resolution one so would it help to turn off UI scaling in that case or even turn off Hi-DPI support?
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I use a Windows 10 notebook
Good question. I donât have this issue on my laptop with just 1080p resolution (Hi-DPI support is still enabled, I think thatâs just the default) but it could be just a coincidence. There seem to be enough people who donât have this problem despite having high resolution screens and UI scaling at least I donât see this issue mentioned often. Thatâs probably one of the reasons why this is till unfixed, because itâs hard to reproduce.
@Ms.Crystal I suggest that you try turning off Hi-DPI support and UI fractional scale factor then restart krita.
It canât do any harm and if it makes things worse then turn them back on again.
Also, can you try Settings â Configure Krita â Display then try switching between Open GL and Direct 3D then press OK and restart krita.
If that doesnât help (if it gets worse, switch it back and restart), then in the same settings place, disable Canvas Graphics Acceleration then restart (even though itâs not supposed to need a restart for that).
Can you also do Help > Show system information for bug reports and copy-paste the entire contents of the resulting window into a reply here?
Even if none of that helps, it may provide information that could be useful, now or in the future.
Can you remember which was the last version that didnât have this problem?
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Disabling Canvas Hardware Acceleration only makes it worse for me, worse than on the screenshot by @Ms.Crystal and then it happens also while just moving the cursor, not just when painting.
I canât say anything about a working version because I only got my 4k displays about a year ago, when I upgraded all my gear and had to use system UI scaling. It could be that it never worked but I didnât notice because I never had to use UI scaling before. I can only say that it happens since the day I use UI scaling.
By the way, the âEnable Hi-DPI supportâ setting doesnât seem to have any effect on my system. No matter if it is set or not, Krita looks the same. I remember reading somewhere that itâs not supported by Linux itself.
Changing from OpenGL to Direct 3D seemed to have worked! Although Iâll still keep this thread updated in case something weird happens again
The last version I used without that issue was 4.4.5
Since the issue seems to be solved, would you still want the bug report? Please let me know
Thank you for your patience and help, Crystal
@Ms.Crystal As a community, we mostly get there eventually
Please do update this topic if anything else related to this happens again.
Also, could you please do this:
because that will give detailed information about your graphics components and it may be useful information now or later.
As for a bug report, I think @Takiro is best placed to answer that, having had previous experience.
I checked but it doesnât seem the bug was reported on kde yet. I was busy yesterday but jut now created a bug report, I included this thread as one example.
I just found out that disabling the setting (Hi-DPI) Enable fractional scale factor should prevent those random lines from appearing.
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