I have used fill regions and making regions many times before but on this particular project they are showing up in front. If I make a box and do a concrete fill region you will see it but it will be transparent, same with a masking region you can hover over it and see its there but it does not mask anything. I have tried making sure the the background is set to opaque and have clicked bring to front but nothing. Im not sure if it has anything to do with the phasing I have set up, if so I am not sure what to do to fix it. I have created 5 phases for this particular project as that is how it will be built. Any ideas!
A masking region should obscure objects of any phase. Are you sure is not a visibility override, or the view is not in wireframe mode?
I just experienced the same problem and was suprised to find, that i simply could resolve my issue by clicking on the filled region > Edit Type > check "Masking".
Good Luck!