Yes, I've come across this as well. I believe that the issue is file/ project specific and not Library related though. Possibly caused by one of the curtain wall macros? I believe it is file specific because I can copy the CW with missing panels from one file and past it into a new .pln and the panels will show up. I tried removing all libraries and then reloading them to see if I could flush out any macro embedded within them but now luck. Are the CW macros not loaded with the libraries? Or?...
I'm currently trying to swap out the CW macros for fresh ones extracted from the AC 16 lib.