I've been using Display Fusion for many years and I can't recall this kind of stuff ever happening before windows 10... I have a couple of programs that I use that after a while of being maximized, about 10 pixels of the edge of the window seem to bleed over into adjacent monitor. The problem goes away for a while if I unmaximize and then maximize the window, but it's still pretty annoying behaviour.

I have confirmed that this issue does not take place when DF is not running, so it is definitely a DF issue. I have use multiple monitor configurations/layouts and it happens to all of them.

The offending programs that I've noted are Visual Studio 2017 and Autodesk Inventor Professional 2018/2019.

I'm using DF on both my home computer and my work PC and it happens on both. It has also been happening over many different version of DF and I'm currently using 9.2.2. I've tied uninstalling and reinstalling DF and that didn't solve the issue either.

You can see in my attached files that the window on my landscape monitor seems to have a border or background that extends beyond the vertical line of my portrait monitor.

I did a little testing on this and I can force the behaviour by previewing the screen saver. As soon as I cancel the screen saver and get back to the desktop showing, the Inventor window is hanging over. If it un-maximize and then maximize the window, the window stays contained within the monitor it is supposed to be in. This is 100% repeatable behaviour and happens every single time I turn the screen saver on.

Locking my workstation and unlocking immediately did not force this behaviour. I haven't tried with sleep/hibernate.

I'll try to keep an eye out as to what else might trigger this but by the time I notice the screen hanging over, it'd be hard for me to pinpoint the cause. I'm constantly swapping windows between PDF readers, Excel, Visual Studio, AutoCAD and Inventor. As a note, when it bleeds onto the other monitor with a vertical split, it shows on both virtual monitors (you can see in the first video).

......and I tested the same two scenarios above with another Autodesk piece of software, AutoCAD Mechanical 2019 and it does not suffer from the monitor bleed issue.

Video two is with Display Fusion off. No weird behaviour...
Video one is with Display Fusion on. You can see the bleed after I shut the SS off.

New discovery.....

I just went into the DF settings and wanted to turn off the TaskBar Buttons. After applying the change, my Inventor window was sticking over onto the 2nd monitor again. 100% repeatable.

It seems like whenever the desktop loses focus or has to be refreshed the Inventor window wigs out and won't play nice.

Please find a fix for this, it's driving me nuts.

This isn't related to this problem is it? The shadow of the tooltip bleeding over to the next screen. Or is this just a quirk of normal Windows and I'm just noticing it now?

Definitely not the same problem.

In my case, the actual window is bleeding into the 2nd monitor, not just the border or a shadow. It only seems to happen with Autodesk Inventor though. After working with their API for almost a year........it wouldn't surprise me if it's a bug in their software. lol.

That being said, the behaviour ONLY happens when I have Display Fusion running, so it has something to do with how DF hooks into the windows interface and manages window size/positions.

Ok thanks. On a side note mmmBoost, has normal windows always done what is in my screenshot and I just never noticed it?

I really couldn't tell you. I've been using Display Fusion for a very long time. You could always just turn off Display Fusion to see what "normal windows" looks like on your machine. DF doesn't change windows.