Random blotches appear mid screen when I Ctrl+Z

I using wacom tablet and these random brush stroke doesn't appeared when i put away a pen from the tablet before ctrl-z!

As of today (3/2/2023), I am experiencing the same thing. I am using Windows, and a Huion tablet. 

Interesting that this has been getting reported for quite a few versions now. I'm testing in Version 4.2.0 with what I believe would be the same devices. I've tried all things which others have suggested as a fix in reverse to try to replicate the problem and I'm not able to create a random spot when using ctrl+z to delete lines.

So I'm thinking it has something random to do specific devices and internal hardware or software versions combinations rather than what is turned on connected or touching another device,

i have the same problem it's very annoying. every time i update the software i hope they'll fix this.

I also have this problem and it only happens in Fresco.  

It has something to do with my mouse cursor. 

The only work around I found was to move the cursor with my mouse onto the sidebar of Fresco (off the artboard). If you have two screens and you place your mouse cursor onto the second screen, by default, it will create a spot on the middle of the artboard. Weird.... 

Fresco needs an update to fix this bug 

Hope this helps 

I also have this problem and it only happens in Fresco.  

It has something to do with my mouse cursor. 

The only work around I found was to move the cursor with my mouse onto the left/right sidebar of Fresco (off the artboard). If you have two screens and you place your mouse cursor onto the second screen, it will create a spot randomly on the artboard. Weird.... 

Fresco needs an update to fix this bug 

Hope this helps 

I chatted with the support team about it and they seemed as if they were on to something at first, only to come to the conclusion that my drawing pad is faulty since the problem doesn't occure when my drawing pad is not connected. I tried to tell them that I really do not think so since a few more people with different drawing pads have the same problem, that the problem is exclusive to use in Fresco and that it started to occure after an update, but they were really not that interested in looking further into it, I was just directed to the bug report tool...

I believe its due to windows ink being enabled... While this is enabled pressing/holding control will work simular to a click/draw... without windows ink removes pen pressure and I havn't found a way to fix this yet

I have the exact same problem too anyone have any solutions for this? 😞 thanks 

Do you have a Wacom mouse sitting on the tablet, in addition to the pen? It looks like a second device is providing input but just sitting in a static position. I have seen behavior like this in Photoshop, so just wondering.

Before the blotch appears, and while you're drawing, it appears there is a second device cursor just sitting there, right where the blotch appears.