Since I upgraded to the new structure-synth, when I initially render it only renders to a small square in the window. If I toggle fullscreen it's fine, + when I come back to windowed mode it is fine again.
I've tried upgrading my display drivers, but it's still the same. (Note graphics card is Intel 965 - not the best, but certainly worked ok before, OS: Windows Vista).
Note: When taking the screenshot via print-screen, after I pressed it the rendering took up the full-window.