MbUnit and Resharper integration not working in Visual Studio 2010

I set up a new machine this week. It is running Windows 7, 64 bit. I installed Visual Studio 2010 Professional, then Resharper 5.0, rapidly followed by Resharper 5.1 when it came out soon after. Since I have a project with tests in MbUnit, I have installed MbUnit/Gallio, using the 3.1.397 version x64 msi installer from here.

I was expecting to see the green gutter icons that Reshaper puts next to my tests, but I do not. I tried removing Gallio and installing the 32 bit version. No change. I re-installed both Resharper as Gallio as per this question, but this produced no change. In this procedure, %APPDATA% is set to C:\Users\Me\AppData\Roaming, so I deleted C:\Users\Me\AppData\Roaming\JetBrains. I have also tried unstalling both Reshaper and gallio, deleting all Resharper and Gallio data from AppData\Roaming, AppData\Local, and C:\Program Files (x86), and then installing again from a cmd running as admin, but again, no change.

Resharper has no plugins listed in the Plugins dialog, and in the开发者_高级运维 Resharper|Options|Unit testing item the "unit testing providers" listed are MSTest and nUnit.

Visual studio has two other Add-ins listed: ".Net Reflector" and "Visual Git".

What do I have to do to get MBUnit working in Resharper?

Which of these two tools provides the integration? Should I install Resharper or Gallio first?

Where do the integration files or settings go? It has been suggested that I should have a "resharper plugins directory" in C:\Program Files (x86)\JetBrains\ReSharper\v5.1\Plugins or similar but this is not present at all.

R# 5.1 RTW is supported by Gallio/MbUnit starting from v3.2.512. You can download the latest binaries of the Gallio bundle in the daily builds repository. v3.2 is not officially released yet but it is very stable already.

UPDATE 1: R#5.1 officially supported.
UPDATE 2: Gallio v3.2 RC with R# 5.0 and 5.1 support.