Yes, it works only for the main taskbar.
I believe that adding support for the secondary taskbars isn't worth the complexity.
First, the secondary taskbars have a different mechanism that limits the width.
Second, the tweaker will have to remember the sizes of all available taskbars.

I could reproduce it on an RTL system.
Seems like a bug of Windows or explorer. The issues happens without the tweaker as well.

I can't reproduce the issue.

I'm closing this, as there's nothing I can do about the report.
If you want to get this solved, you'll have to provide more information so I can reproduce the issue.

If the update of Clover caused the issue, isn't it more logical to contact the Colver author about it?
Having said that, I'll look at it when I'll have the chance.

Hi,
OK, so the problem is that the "Open file location" item on Shift+Right click doesn't always exist, right?
I'm afraid I don't know how to solve this.

There's a registry option for that.
http://www.sevenforums.com/tutorials/21233-taskbar..

I can't reproduce it. Also, from the comments it seems like it works for other users.
Please provide more information, such as a screenshot, your tweaker's options, and the taskbar properties. Otherwise, I can't do much with your report.

Does the tweaker itself crash, or does explorer crash? Can you provide a crash report?
How do I find event logs when a program crashes?

What do you mean by "it doesn't mess with context menu of Jump List"?
Looks like that's exactly what it does - it provides a way to manage the Jump List.

As far as I know, the HKEY_CLASSES_ROOT items affect the right click menu of files, and have nothing to do with the jump list.