I develop and maintain an application that takes advantage of ASP.NET hosting
internally. More explicitly, its an ASP.NET application that creates
instances of its own pages internally (GetCompiledPageInstance) to do
one-time meta-data collection.

After installing KB886903, all calls to GetCompiledPageInstance die with
HttpException in a function called
System.Web.HttpApplication.CheckSuspiciousPhysical Path. There doesn't seem
to be anything wrong with the virtual or physical paths getting passed in, so
I'm at a loss to know how to proceed. Uninstalling KB886903 solves the
problem for now, but isn't a long term solution in my eyes.

Can anyone out there shed some light on this?

Thanks
Ian