Test Runner cant load log4net

I have just updated to the latest version of Typemock Isolater, 8.2.3 from 7.5.1. Tests are running fine when I run them through Test Driven.net.  When I run them through the type mock test runner, I am getting an error that log4net could not be loaded.  The application I am testing uses 2 different versions of log4net. Some 3rd party assemblies used an older version of log4net that had has a different public key token than then newer version. To get around this issue, we have a binding redirect in app.config like this