[Gameplay bug] Unsealed Spellbook grayed out level up skills

I experienced this bug in a ranked game on SR with singed , taking unsealed spell book. It occurred twice, and ended up getting me in leaverbuster (awesome, right?) When I loaded into the game, I could see all the character models and it allowed me to move around. There were no errors up to the point when I loaded in. When I loaded in, however, there were no health/mana bars above the models, the plusses above the skills were transparent and unselectable even through a hotkey. The skills themselves were completely grayed out and the q also was blue, like I was out of mana, despite being on the fountain. The second time I encountered this bug (two times in a row) I tried to change video settings, thinking it might refresh and fix the problem, but instead it bugsplatted and closed out the game. Not sure if the rune was the cause, but this is the first time I tried using unsealed spellbook, so I think it might have something to do with it. Either way I'm staying away from that rune for now.

Update: Repaired client and opened with singed with unsealed in practice mode, and the bug did not occur. Might be only in pvp games or have some other trigger.