[SoapUI 5.2.1 bug report] Reproducible project corruption on SoapUI exit

Environment: SoapUI 5.2.1 with Java SE 1.8.0_45-b14 on Windows 7 Pro x64.

Actual result: I have a project containing two services with both mock up and requests. On SoapUI exit (no matter how it was initiated: menu, shortcut, red X) corrupts the project when clilcking on "Yes", it remains OK when clicking "No". Even after clicking "Yes" it stays open! The corruption is that the contents of request A gets overwritten with the contents of request B.

Workaround: Save manually and close SoapUI with "Exit without saving".

Expected result: SoapUI closes on "Exit" and does not corrupt the project.