After launching the game mouse cursor is stuck in an area occupied by Windows Dock, clicking mouse would take back to windows. So I have to alt-tab or click the game icon in the dock to get back into the game. As turns out this disables particle effects in the game.

Some screens for comparison 

Game launched with Windows dock set to auto hide.

Game launched with Windows dock. Alt-tab'ing or click the game icon in the dock is needed to 'free' mouse cursor and get back into the game.

I managed to fixed it by setting Windows Dock to auto hide. Still it's very annoying and need to be fixed.