when I open dolphin all is fine,
when I left click on a file item to run the corresponding action (e.g. open a video file using VLC), the program starts.

When I close VLC, dolphin no longer accepts clicks anymore.

Keyboard works fine but mouse button do not work anymore.

I noticed that this does not happen with all programs (just with most). E.g. viewing with dragon player does not seem to 'kill' the mouse buttons.

However starting a konsole (e.g when you click on a bash script) does kill the mouse buttons.

This is VERY annoying