it's on my own PC though I'm often plugget to a network. Anyway but I'm not 100 % sure about it, I had the same problem also when working stand alone.
Anyway I built a ProjectHook class to my project which provides to backup any file before I open it for modifying. In this way I'm sure that I'll loose only the last release of the file. Better than nothing :-))

>Hey Alessio,
>
>well, I had the same problem. When I opened the forms scx file and looked at the code, I also found a whole bunch of strange characters. How does this happen ? I don't know. But the message 'The file is not open' lets me think maybe it's a network problem ? Is your project on your local computer or on a network drive ??
>
>Greetz,
>Hans