This one appears in 436 and some previous versions.
Selecting Track/NR -> Grain removal -> Next
wait for completion then select -> Back
and the image disappears. Cancelling the module and then re-entering doesn't bring it back in the module although it does reappear on the main screen.
Back button in Track/NR causes image to disappear
Back button in Track/NR causes image to disappear
Skywatcher 190MN, ASI 2600 or astro modded Canon 700d, guided by OAG, ASI120, PHD2