M.I.X wrote...
It looks like it may have something to do with being flagged as having controversial content. Even though the games are visible for me elsewhere on the site, it would seem that purchased games with controversial content are not listed in my library. The same seems to be true for books too (i.e. Bosshi's XXX MiX). Doujin works seem to all show up though.
The game in question is Maitetsu, which has the loli tag, so yes that might be the case.
The weird thing however is that I purchased it right when it came out 2 years ago, and until now it has always been visible.