Ctrl+S makes the app freeze

I'm trying L3DT 16.05 Standard and facing a problem where the application stops accepting any operations. Here is steps to reproduce:
Is it same with Pro? I hope this project is still alive...
- Launch L3DT 16.05 Standard
- Create a new blank designable map via L3DT Wizard with default settings
- Hit Ctrl+S
- Put some proper filename and save it
- Close the message dialog
- Hit Ctrl+S again
Is it same with Pro? I hope this project is still alive...