Under review
I have checked it on my Windows 10 PC, and it starts as expected.
Do you see 7+ Taskbar Tweaker in the startup list? Perhaps it was mistakenly disabled?

Nope.  Clearly shows in the startup list as being active.  It worked fine until the latest Win10 1803 update.

Does it work when you run it manually? If it does, it's clearly a system issue which is unrelated to the tweaker.

Indeed, runs fine manually.  I see you posted another update a few days ago (I was using an alpha) so I'll give that a try. 

Douh! - I don't recall switching if off, but I was - 'my bad' as they Americans say. Big fan of the app, these little things really matter. Sorry to have bothered you, I'm sure you have better things to do.