Windows 10: Aero peek not working and multiple thumbnails not showing up

I think this happened after I've set visual effects to "adjust for best performance" and set it back to custom and enabled all settings later on. Here are screenshots of settings i currently have set:






Desktop peek is working fine, but when I hover over window thumbnail, it doesn't show me the window.

Also if I have more than one windows from the same program opened, it doesn't show individual thumbnails:




Any idea what could be causing this?

:)

 

Taskbar Aero-Peek doesn't work with more than one window

Aero peek works perfectly fine with just one window, but when multiple windows of the same application are open, the titles are displayed instead of thumbnails. I think this only started happening after I updated windows. Any ideas? Thanks.

 

no full screen preview when hovering taskbar thumbnail

Last time when I fresh install Windows 10 and whenever i hover my mouse cursor to multiple opened browser it show thumbnails, and when I next hover the cursor to that particular thumbnails it will show full screen preview as you might say peek. Now it doesn't
do anything anymore.

Can anyone help?

The picture attached is the preview thumbnail and when i try hover to the default Firefox browser it does not 'peek' into it anymore.

 

Fixed it by going to regedit and setting DisablePreviewWindow to 0 under Advanced and setting NumThumbnails under Taskband to higher value, both of the folders were in HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer