P: Photoshop 26.6.0 is selecting non-current canvases

The problem/bug is in under investigation to be fixed by adobe, they have managed to reproduce it. For now you can just turn off "enable modern user interface" in Preferences/Technology previews. 

@zsolt_6914  

Unfortunately you don't have gave us any informations about your system. So all proposed solutions are a guesswork.

Please describe more detailed. What you've done before the error occure? Desribe the steps how to reproduce the issue. What you've tried to aolve the problem?

Is your system up-to-date? Do you have installed all recent updates and patches for the operating system and the device drivers, especially the graphic driver. If you have a NVidia graphic card installed, make sure that you are using the recent Studio version of the driver, not the Game Ready version.

Maybe you can post your Photoshop system info. In Photoshop goto Help > System Info and hit the copy button. Then paste the entire informations into this thread

Same problem, updated win 11, gpu and adobe. I use 3 monintors. 

Hurray! Thank you for listening and taking the time to find and fix it 🙏😊

We think we found the problematic code. The fix affects Windows only and has been made in the 26.8 release branch a few minutes ago.

Hi that is great news! sorry then I miswrote. I meant I downgraded from 26.7, it was still in 26.6, but not in 26.5. I didn't go further back then. So it's safe to assume it appeared in 26.6

@donbarrum We've finally had someone reproduce in-house late last night, which is a huge leap forward in diagnosing the issue. We still don't know the cause, but we're able to actively hunt the bug now. We do know that the other fix put in last Friday which I had speculated might resolve the issue - does not. It's something else.

(In your OP, you indicated it happened in 26.0 and 26.1. Did it go away for 26.5 and then reappear in 26.6 and later?)

@CJButler yes that's right. You don't need to use the keyboard. And you don't need to drag the mouse either, it happens when you click in the image/canvas with either of the tools I mentioned (probably any tool that allows a click). Example: I select the pick color tool, find a place on the canvas to click, I click the mouse and boom the another image below is now on top. Or, like on the video i posted previously, I open or create 3 images in photoshop and all ready then the second or third image appear below any of the ones that are allready opened, without clicking anywhere on the image. So you don't really know which image is active. And yeah you are right 🙂 it's quite frustrating 😉 PS! And of course this is not an inentional behaviour or me doing something wrong. I have more than 30 years of experience in photoshop, and this bug never happened before Photoshop 26.6. If I roll back to Photoshpo 26.5 its all good. 

@10337032 @Stephen - HU3D 

Thanks - that's interesting information.

Just to confirm, the bad behavior happens without ANY keyboard events. Just selecting tools and using the mouse? No keyboard chording with the mouse? Any only while the mouse-button is still down during the drag? Or when the mouse-button comes up?

(edit add: And just to confirm, none of this is intentional behavior. It sounds like a pretty horrific user experience. I just wish we could see it happen under a debugger and figure out the conditions that allow it to happen.)

And, here are the answers to the other questions: @CJButler 

-turning off the Contextual Task Bar also fixes it. And it doesn't start again when I turn it on unless I create or load new images. 
-Docked windows also works, it doesnt jump to any of the other images then. 

Answers to questions:
I use overscroll (ON)

I do not use move tool auto select (off)
I use the space bar to pan, but not with auto select though. 

What happens when I use the hand tool without space: the same thing happens, it selects other canvases. But as mentioned this happens with anything else than hand tool as well (fill, pick color, pick layer using short cuts and when selecting them in the menu)