When I try to run NUnit tests in Gallio I get this:
Detected a probable test framework assembly version mismatch. Referenced test frameworks: 'nunit.framework, Version=2.5.3.9345, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77'. Supported test frameworks: 'nunit.framework, Version=2.5.0.0-2.5.2.65535', 'nunit.framework, Version=2.4.8.0-2.4.8.65535'.
I use Gallio v3.1 build 397.