Failed Prints after long successes

[cliffyk]

How are you testing the LCD shutter? I ask because using the built-in "exposure test" masks any problems there might be in the central 75% of the display with that dark central box.

See my post here re: testing the screen with a 68 x 120 mm "block" that reveals defects in the entire screen.

"Holes" in the printed model are a 99.44% indication of dark spots in the LCD shutter...