Fenris (https://nexusclash.com/clash.php?op=character&id=2258) used a pact of Greater Glyph Erasure, but was unable to cast it. The spell casting pane appeared, but there was no contents in it. There was no option to use it in the combat pane, either. In which one should it appear, anyway?
I was able to attack said glyph normally, so there was a valid glyph on scene, too.
For what it's worth, he was in wolf animus, which also has broken Enhanced Senses, but I don't know if that's related.