Kerbal Space Program

Symptom: in-game UI at Space Center is uncontrollable after particular interaction (I found the problems mostly at the Astronaut Complex, however that's not all that bugs the UI). Cannot press Exit, Escape, Time Wrap or Enter Building...

Attachment: save.rar, containing 1.srf and persistent.srf

• First method:
  + Load persistent.srf
  + UI uncontrollable, cannot enter buildings, time wrap... (can still press Escape and load other file)

• Second method:
  + Load 1.srf
  + Enter Astronaut Complex
  + Exit Astronaut Complex
  + Enter a particular building (in my case, Tracking Station)
  + UI uncontrollable (cannot Exit building)

Note: after the second method, exiting by Alt-F4 will create persistent.srf that behaves as same as in the first method.

• Comparing 2 srf files, I found some differences (don't know if they are minor or major) in the orbit of vessels, kerbal list... They can be the problems.
• Currently, the Astronaut Complex is at level 2, and there is a maximum number of Kerbals recruited (12/12). In my guess, because of the limit being reached, the game disables the recruit buttons, and that might disables buttons of the whole game.