When a user save the script, the editor don't care there are already recent script or not and overwrite the existing one.
When user A click the revision number in the perftest config panel to see the script,
it shows the used script for this test. However if the other B user modified that script, the real script revision number is higher than user A sees.
User A might mistakenly replace the existing more recent script.
I've faced this problem even when I modify my script by alone.
nGrinder need to give the warning to let the users know what they do.