StartAllBack for Windows 11

[lubierzca]

3 hours ago, Lars-Erik said:

I have a strange question. When I scroll to the top or bottom in Explorer the whole windows moves up/down.
Never seen this before. Is this a Windows 11 thing or what causes it, and how to disable it :-)

It's definitely not a Win11 thing, can u record a screen while this happens?

[znerolnoht]

I'm trying to make a new taskbar icon for the start menu. I can see where to add one but trying different file sizes and types (pngs, svgs) results in an error or the icon is incorrectly displayed. 
Can you help with the requirements/formatting for a PNG or SVG?