Switching between custom layouts or navigating away and returning from the project explorer doesn't seem to clear and re-apply filters. I have been finding that some projects which should be visible in certain custom layouts are not. I have had other users comment on this as well. Expected behaviour is the filters clear and re-apply each time a new custom layout is selected or when navigating away from the project explorer and returning, should again clear all filters and re-apply the filters specific to the current layout.