sp_BlitzIndex v 4.5 (2016-11-15) failing with collation error
We've been working together on this error over here:

https://github.com/BrentOzarULTD/SQL-Server-First-Responder-Kit/issues/607

Turns out that the problem is contained databases. If you have a contained database, sp_BlitzIndex fails. (I've never actually seen a contained database in the wild before, so that's kinda amazing - wonder how long this has been broken.)