Something weird just happened.
I opened my C2 project and everything I had done yesterday (14 aug) was gone, so i checked the date of the file and it had revert to the 13 aug.
However, not everything was lost. In the same folder I had autosaves from the 14 aug, strange but glad that part worked. Also had a backup from the 14 in another folder.
Is it a C2 (R173) bug, or something to do that I sync same folder with dropbox?