MX Master 4 horizontal thumb wheel stops working after MacOS 27 update in some apps when Smooth Scrolling modifier is enabled

[szirtesi]

Subject: MX Master 4 horizontal thumb wheel stops working in some apps when Smooth Scrolling modifier is enabled

Hi Andreas,

I’m using an MX Master 4 for Mac with BetterTouchTool on macOS 27, without Logi Options+.

I found a reproducible issue with the “Smooth Scrolling (like Trackpad)” scroll modifier.

Setup:

• MX Master 4 for Mac
• macOS 27
• BetterTouchTool only, no Logi Options+
• Thumb wheel used for native horizontal scrolling

Problem:
When “Smooth Scrolling (like Trackpad)” is enabled, the MX Master 4 thumb wheel no longer scrolls horizontally in some applications.

Affected apps I confirmed:

• Finder
• Adobe Photoshop

Apps where horizontal thumb wheel scrolling still works:

• Safari
• Microsoft Excel

Important observations:

• If I disable the “Smooth Scrolling (like Trackpad)” modifier, the thumb wheel immediately starts working normally in Finder.
• If Smooth Scrolling is enabled, the thumb wheel does not work in Finder normally, but it does work while I physically hold the Command key.
• I have a separate Command + Scroll modifier configured for zooming. If I disable that Command-scroll modifier, Command + thumb wheel stops working as well.
• Moving the Smooth Scrolling modifier to the bottom of the scroll-modifier list does not change the behavior.
• “Simulate Trackpad Scrolling” is disabled. I do not want to use trackpad emulation as a workaround.

This makes it look like the Smooth Scrolling modifier is intercepting or altering horizontal scroll events from the MX Master 4, and some applications such as Finder and Photoshop no longer accept those events. A modifier-specific scroll rule seems to bypass this behavior, which may explain why Command + thumb wheel still works.

Ideally, it would also be useful to have an option such as:

“Only apply this Scroll Modifier to vertical scroll events”

That would allow Smooth Scrolling to be used for the main vertical wheel while leaving the MX Master thumb wheel as native horizontal scrolling.

Please let me know if I can provide a debug log or test a development build.

[Andreas_Hegenberg]

can you check whether this is resolved in 6.825? (uploading now)

[szirtesi]

Looks weird, still not works, but if I hold the CMD button, thumb wheel starts to work in Finder. And randomly works without CMD.

[szirtesi]

I tried in Photoshop, there is no more thumb wheel issue. Looks like only Finder is affected.

[Anurag_Kashyap]

Can you share your btt preset so I can check on my device too!

[szirtesi]

Default.bttpreset (503.2 KB)

[Anurag_Kashyap]

Look like something wrong with your settings! For me its working with my configuration, but not with yours (maybe something conflicting)

These are Mine BTT mx master 4 Presets

exported_triggers.bttpreset (35.8 KB)

Update: Just changed the value of horizontal mutiplier and your settings started working for me

[szirtesi]

Thanks, I will try yours tomorrow.

[Anurag_Kashyap]

Just try changing your horizontal multiplier as above, and check if its working or not first

[szirtesi]

Thanks, but not worked. But this setting works, very strange....

[szirtesi]

Finally found a solution. In my preset is missing the Distance per Tick trigger. Added this, and works fine.