There are a series of threads on this common problem. As you know, the top screw bears the entire weight of the door and enables it to swing open/closed. It is a poor design and there are a number of workarounds that will allow you to lift the door higher so it will open and close. I replaced the entire shower door in my 2012 28' Intl CCD with a higher quality door, and expect that at some point I'll have to do the same thing with my '15 Classic.
"SilverLeaf II" 2015 30' Classic
2014 RAM 2500 Laramie 4x4 CC w/6.7L Cummins
WBCCI # 3430-Unit 21