So I went into a cave, had a fairly difficult encounter and managed to beat everybody. One of the enemies, Bipara, left behind a grimoire. It's always interesting to check into these. But this time I'm confounded. When I open the grimoire, what is see is the attached image. Has to be a bug, surely? Is this what everybody else gets when they find this grimoire?

Yeah, that's a visual bug affecting all grimoires. I think it only happens when you inspect them from the combat log? I know I've seen a normal looking grimoire, either equipped or in the stash

You know what? I didn't even think to check that. So, I went and checked all of Aloth's grimoires from his inventory, including the one he's got equipped at the moment. They're all visually bugged in exactly the same way, showing only two spells, listed as level V but actually being level I.

 

I re-loaded my save, and they're all bugged. I loaded the oldest save I could find, from late December, and they're all visually bugged.

 

I never saw this before today. This would rather strongly point towards the patch 4.1 as the culprit, wouldn't it?

All Grimoires I opened after the recent patch has been this way. It’s been reported by multiple people.

Ok. Good to know. Sounds it's likely to be fixed soonish, then.

Oddly enough, when I played tonight all Grimoires worked fine. Either there was a hot fix I missed, or the issue is a bit more elusive then it seemed.

Another thing introduced in 4.1 is that characters in stealth mode no longer move slower than in normal mode. I wonder if that's intentional.

Someone offered the theory that the bug only applies to savegames from before 4.1. I have not been able to verify, but it might be worth checking, yesno?