I'm not sure what happened, is there a way to disable them? Maybe I modified something, but not sure what that could have disabled them :-/
I have 3 open spots and 3 closed ones. If I try to insert a glyph, then this is what I get : "That Glyph cannot be inscribed there"
Note: this is a 255 level realm
Edit : I noticed in character_glyphs table, some characters have managed to add glyphs, but like 99% hasn't been able to.