See summary and steps to reproduce

h4. Steps to Reproduce
1) install MP using rc3 installer/deploy tool on a clean computer and choose Single Seat.
2) after installation start configuration.exe
3) Save
4) crash

h4. Additional Information
Description:
  Stopped working

Problem signature:
  Problem Event Name: CLR20r3
  Problem Signature 01: configuration.exe
  Problem Signature 02: 0.9.2.28945
  Problem Signature 03: 48aed593
  Problem Signature 04: TvPlugin
  Problem Signature 05: 0.9.2.29003
  Problem Signature 06: 48aed607
  Problem Signature 07: ab
  Problem Signature 08: 0
  Problem Signature 09: System.NullReferenceException
  OS Version: 6.0.6001.2.1.0.768.3
  Locale ID: 1035