"Program not responding"

[Matthew]

No idea why but whenever I try to re-enter a vehicle on planet (in this case, Mars), orbiter freezes up :-/ Here's what it says:

Description:
  A problem caused this program to stop interacting with Windows.

Problem signature:
  Problem Event Name:   AppHangB1
  Application Name:   orbiter.exe
  Application Version:   0.0.0.0
  Application Timestamp:   4c7b0d0d
  Hang Signature:   2ab0
  Hang Type:   0
  OS Version:   6.0.6002.2.2.0.768.3
  Locale ID:   1033
  Additional Hang Signature 1:   dc807ce61d10881d0e0f28bcb7a08ec8
  Additional Hang Signature 2:   e301
  Additional Hang Signature 3:   b176d859008295dd9272217600e8ac9d
  Additional Hang Signature 4:   2ab0
  Additional Hang Signature 5:   dc807ce61d10881d0e0f28bcb7a08ec8
  Additional Hang Signature 6:   e301
  Additional Hang Signature 7:   b176d859008295dd9272217600e8ac9d