That's the option I already have set. Looks like it's the default.

I couldn't reproduce it. I disabled my sound device, and scrolling over the taskbar launched the Windows troubleshooter. That happens since the feature simulates a click on the volume control icon, and it launches the troubleshooter when no sound devices are available.

What happens on your laptop when you click on the volume control icon? Also, can you make a screenshot of the mostly black window?

What's the build number of your Windows 10? Are you using the latest beta version of 7+ Taskbar Tweaker? Do you have an access code for the experimental support for version 1903?

7+ Taskbar Tweaker v5.6.2.3 beta should fix this.

Relevant (for Windows 10):

https://tweaker.userecho.com/communities/1/topics/611-use-new-volume-slider-aesthetic-fixupgrade

Done in v5.6.2.3 beta, please try it out.

It's possible by using the tray_icons_padding advanced option, which is available for Windows 10 since 7+ Taskbar Tweaker v5.2.

Probably a duplicate of this:

https://tweaker.userecho.com/communities/1/topics/14-windows-10-remove-clock-padding-on-vertical-taskbar

If not and if still relevant, please let me know.

Works for me. See the attached gif.

Yes, it's related. If the tweaker fails to load, the options won't work and you'll get the "Not injected into explorer" message.

I plan to fix this, but not before I add support to Windows 10 Version 1903.