Problems with mollies/bolts in plaster wall
After my bathroom wall was painted, I had to re-hang a small shelving unit. I bought new mollies for the old screws and had thought I'd hung the unit back up successfully, though one of the anchors was a little shaky. That was good for just over a month, then the unit came crashing down. I just tried again, using metal anchors rather than plastic ones. Two went in fine, but two just wouldn't lock. Do I just have bad anchors? Might something be wrong with the holes? Thanks.