Not sure how to describe these issues too well.

With DisplayFusion managing my screens, I get a ton of small to moderate but frustrating issues.

My left monitor (3840x2160) seemingly has an invisible split or is being merged with my ultrawide monitor somehow (3440x1440). Windows only maximize to the top 3/4 of the monitor and while I can manually resize them, this obviously isn't ideal as it forces windowed states and is difficult to get into place. Borderless applications are especially an issue since they absolutely refuse to use the full monitor.

The bottom quarter is totally ignored, windows never maximize to that area.

Dragging a window in my 4k monitor causes the DisplayFusion shortcut button to be totally offset, being about 2000 pixels into my ultrawide. I don't use the button, but it might be a clue in what the issue is.

Task bars are often overlapping or don't appear at all. This might be related to the "Use these Features with Split Monitors" section of the settings, but I prefer to have one taskbar per monitor rather than per split.

The start menu often doesn't appear on certain monitors, or will appear far above the taskbar or cut off behind and below it.

I can deal with most of these issues but only being able to use 3/4 of a 4k monitor is a dealbreaker, as annoying as the rest of the issues are. I'd really appreciate some help with this as it's driving me crazy.

Hope this can help. I had to enable the ultrawide as my primary monitor for the splits issue to show up again. With the 4k monitor as my primary monitor the splits weren't working, but the invisible split was gone.

Hi Owen, apologies for the delay. Here's the output from the tool.

I've been able to narrow the issue down to multi-monitor taskbars. It seems to be the only thing causing the issues. With multi-monitor taskbars disabled the ghost split on my 4k monitor is gone, but if I enable multi-monitor taskbars whatever windows are on my 4k monitor immediately shrink down and the ghost split returns.

Some of the other scaling issues beyond the ghost split return with M-M taskbars enabled, so I'm pretty confident this is what's been causing all the issues. Disabling them through DF fixes all the issues, but of course means I can't use the taskbar feature.

Monitor splits don't seem to be causing or affecting the issues I originally described.

Here's the outputs with Multi-monitor taskbars on (MM-On) and off (MM-Off).

Hi Owen, thanks for getting back to me.

Here's the debug log output. I enabled multi monitor taskbars around 01:30. Hope this can help diagnose the issue.

Left is an ASUS VP28UQGL, middle is Gigabyte G34WQC, bottom is an XP-Pen Artist22E Pro. The GPU is a Gigabyte RTX 2060. The standard monitors are connected with DisplayPort, and the tablet with HDMI.

Just the Windows virus protection that comes with Windows 10.

Hi,
The tool doesn't seem to be working. Just to check, the correct file to run is "BFCustomerTest.exe"? Unzipping the folder and running the file normally and in administrator mode doesn't seem to do anything.

Hi Owen,
I have attached the log here. Hope it helps.

Hi,
Not sure uninstalling the monitor drivers did anything. Could you provide directions for the uninstallation process if the logs don't show the expected results?
Thanks

Hi, could I get an update on this thread please? I'm still struggling with the same issues.

No problem!

With "Show Hidden Devices" enabled, there are no adapters listed other than my RTX 2060.

Hi, here's the exported info. Just a heads up - the 4k monitor has been rotated to portrait mode since the last time I sent over troubleshooting info.

Hi Owen,

I did a full uninstall of Teamviewer - no improvement on the issue unfortunately.

I did have an idea though, and remembered that windows by default changes the scaling of text for certain monitor sizes. Changing the scale to 100% seems to have solved the issue (although it does make the cursor and text uncomfortably small and difficult to read).

That said, would it be possible to add support for monitor scaling in future versions of DisplayFusion? As happy as I am to be able to use DF's features properly now, it is difficult to use most apps at 100% scale with high PPI monitors.

Thanks for offering your help over the last few months! I hope me finding the solution can help other users with similar issues.

Sure - here's the results of 100% scaling (and 150%, just in case it helps).

The issues come back at 150% scaling - windows snap incorrectly, splits stop working, the DF shortcut near the minimize, maximize and close icons becomes offset again, etc. When I swapped back to 100% after saving the diagnostics everything went back to normal.

None that I'm aware of - I'm using a fresh install of the Steam version of DF.