[Admin note: See this post on page 2 for a version of TortoiseSVN which should resolve the problem until the TortoiseSVN 1.6.7 release. Just adding this info to the root post so it's easy to find.]
I have the latest version of Opus 9, and recently updated Tortoise from 1.6.2 to 1.6.6. Later that day, I started having problems with Opus. I can't absolutely swear that Tortoise caused it, but it's all I remember doing between working fine and having problems.
Maybe once out of 10 tries, when I open Opus, it brings up most of the window, but then locks up, and I have to end task. During that time, Windows (XP Pro) file manager still works fine. When Opus does open, everything works fine, including Tortoise.
Has anyone else reported problems after loading the latest version of Tortoise? If I had a copy of my old 1.6.2 Tortoise, I'd install it to see if the problem went away, but I can't seem to find one.