Help! My grasshoper canvas turned transparent?

Hi all,

I was working and suddenly my GH cnavas turned semi-transparent and seems to stay so after restarting Rhino and the laptop.
Does anyone know how this might have happened? it could be a nice effect bt it hasslown down my refresh rate for the canvas to 5 framse per second, whis is really not ideal.

Any suggestion appreciated, screenshot below

Uninstall plugins and restart until it disappears.