XYplorer Beta Club

I currently have an annoying problem on my NoteBook. Either a key is stuck or a running program is constantly sending me keystrokes. These interfere with many applications, but I do not know which keystrokes they are.

But when I'm in XyPlorer and move the mouse pointer over the tabs with the opened directories, they jump from the rightmost tab to the first left tab. Step by step. Just like when I type Ctrl-Tab. But only when I am with the mouse pointer in the tab area.

Question is what key combination could this be in XyPlorer besides Ctrl-Tab and Shift-Ctrl-Tab?

A hint: When I hover with the mouse into the directory area in MS File Explorer, the selected directory moves by itself to the first line of the directory tree, like a very fast scroll.

I know, this is a very funny question, but thank you in advance...
---
Translated with www.DeepL.com/Translator (free version)

Could be the mouse wheel sending ghost turns?

Wow! I think that was it.

My faithful old L..tech mouse. I could reproduce it.

Unbelievable that such a small thing can give you almost 2 days of troubleshooting headache.

Thanks a lot for the tip!

The Mouse Wheel klick-left stuck (On an Anywhere S2) ....