There is a possible software conflict for Windows users running disk cleanup software and Celtx at the same time. Data loss can occur if the third party software deletes temp folder files WHILE Celtx is open.
Celtx extracts project data into a temp folder while your project is open. If third party software removes the extracted files (while your project is open) data loss can occur.
Some examples of Windows programs that clear temp files are here:
Norton's 360 all-in-one product also includes Clean Sweep - a utility that can clear temp files.
If you are a Windows Celtx user and you have disk cleanup software running in the background please modify the disk cleanup software settings so that it does not automatically delete temp folder files.
If you manually run the disk cleanup software, please insure that all Celtx projects are closed before you run the cleanup software.