Please see the following blog post:

http://rammichael.com/7-taskbar-tweaker-for-windows-10-fall-creators-update

Error 209 means that 7+ Taskbar Tweaker could not place the necessary hooks in explorer. The error indicates a failure of the MinHook library which the tweaker uses.

One possible explanation is that there's a conflict between 7+ Taskbar Tweaker and another customization tool. Perhaps 7+ Taskbar Tweaker only runs successfully when it launches before the other tool.

Good catch, thanks! Should be fixed in v5.3.0.6 beta.

In my tests, the click doesn't work on a secondary taskbar. You can identify whether a taskbar is secondary or not by looking for a notification area - if there is one, it's the main taskbar. Otherwise, if it only has a clock, it's a secondary taskbar.

For the case of one monitor, it should work. Make sure that the taskbar is locked.

Note that even though a single click doesn't work on a secondary taskbar, a double click works. A single click doesn't work due to the way the taskbar is designed. I might look at implementing a workaround in the future.

Actually, it was simpler than I was afraid it would be. Should be fixed in 7+ Taskbar Tweaker v5.3.0.5 beta, please try it.

Implemented in 7+ Taskbar Tweaker v5.3.0.5 beta, please try it out.

It's not a bug. Currently, "The notification area" only refers to the notification area on the main monitor.

I can see that it makes sense to use the secondary clock, too, even though it's not strictly a "notification area".

I'll look at it at my spare time.

I could reproduce the issue. Unfortunately, the combining option implementation is rather complex, so there's no simple fix. I'll look at it one day, but it's not a priority.

I've checked it. What happens is that StartIsBack++ completely re-implements the function that is responsible for drawing the taskbar buttons, CTaskBtnGroup::Render. Therefore, the changes that the tweaker does don't apply.

7+ Taskbar Tweaker can't do much about it. A possible solution would be for StartIsBack++ to provide an option for the users to keep using the original rendering functions (and maybe limiting the functionality as a result).