You used Lightworks on Windows, right? Apparently Linux version is not yet stable, as I have understood.
No, we are using Lightworks under Ubuntu 12.04, is pretty stable under this OS and in case of unexpected closure, LWKS has a robust autosave with milestones every second so you can do undo/redo also after closure; is really hard loose something.
The problems of Ubuntu version are the lack of all export codecs, some little bugs and other little stuff but is possible find a way for use it enjoy.
Anyway we have also the Pro version on laptop under Windows 8 for every problem in export or for the works on location.