Hi!
There seem to be a bug in the overlay outlines module, when changing channels and image contrast back and forth. I usuallly put the image contrast to “log normalised”, then i remove the blue and the green channels, to investigate the red image. If i then want to go back and change the image contrast, nothing happens, until i change something with the channels, select one more or deselect one channel. I’m using an iMac or a MacBookPro (OS ElCapitan).
Best,
Gabriella