Latest Typemock Isolater (5.3.1) breaks F# integration

After I updated Typemock Isolat0r to version 5.3.1, F# stopped working with Visual Studio. Every time I try to build, I get an error stating "fsc.exe has stopped working". Debugging showed me the following:

Description:
  Stopped working

Problem signature:
  Problem Event Name:    CLR20r3
  Problem Signature 01:    fsc.exe
  Problem Signature 02:    1.9.6.16
  Problem Signature 03:    4a119958
  Problem Signature 04:    FSharp.Compiler
  Problem Signature 05:    1.9.6.16
  Problem Signature 06:    4a11991a
  Problem Signature 07:    93eb
  Problem Signature 08:    49
  Problem Signature 09:    System.InvalidProgramException
  OS Version:    6.0.6002.2.2.0.256.6
  Locale ID:    1033

I only realized it was Isolator after reinstalling Visual Studio and all of my tools one at a time until Isolator finally proved to be the culprit. I couldn't figure out what was happening to cause the issue other than the presence of Isolator being installed.

As a work-around, I can run MSBuild from the command line.