Losing changes made to a script
Could you please let us know at what point exactly you are losing your changes.
As i didn't faced this in past 2 year, i think smartbear team have resolved this issue.
What you can do is:
1. deleting temp files from %temp% folder if you are on Windows and
2. In Preference Setting , tick on the option to save and exit option by default.
3. In Preference setting, Select option to auto save project after 30 mins or 60 mins interval