I have created a simple character in Mb-Lab without finalising the character yet. I wanted to make some adjustments in sculpt mode on the eyelids. Because the eyeball is always transforming together with the eyelid I wanted to mask the eyeball. I found the option to apply the mask and used it to mask the eyeball. The masks seems to be there ( as the eyeball and part of the eyelids are not moving anymore) but I cannot see the mask.
I already checked for modifier that could hide the mask and deactivated them. I also checked if the viewport option for mask in sculpt mode was on an on 100 % visibility. Still the mask is invisible and I need to make some adjustments to the mask to properly isolate the eyelids.