New install of the latest Mint distro.
When I open a programme such as "Thunderbird" or "VLC" I get nothing showing on screen, I get the normal lower task bar indication stating that it is open. When I right click on the indicator, I have three choices "Close", "Minimise", "Maximise" but clicking these do not do anything immediately, it takes many clicks on various choices to actually open the programme on screen.
This also happens when I try to open a music file with VLC, it plays but cannot see the video, right cicking the indicator gives the three options above but does not have any effect.
Any help appreciated.