TS 2013 oddity

[jamesphh]

While editing a route, adding new lighting, I had done a save and returned to the scenario I was using to check the additions. When I returned there was no sounds, exited and tried again. No sound. Back to Windows and found that all sounds were in mute mode including Window sounds. Also the route was now locked. Easy to correct but why? There was no SBHH or crash. All added items were present. Just anothe glitch!