Does anyone know whether this bug has been fixed in 1.4?? It's not mentioned in the notes, but I ask because I know that not all of the bugs fixed in the patch were mentioned there (i.e. the Markarth guard bug after completing "Escape from Cindha Mine"). The bug prevents you from being able to use 1) Sanguine Rose and 2) Atronach summoning staves, once you've taken the perk.

It definitely wasn't. I fixed it myself for the USKP on the latest ESMs and it hadn't been touched.
(I reported it as well and it's a one-clicker.)