Hi all.
We have a nearly same problem that HenriPierre.
We have the 1.0.1 build 1812 (64-bit) - Windows 7 familial premium, 8GB and an i7 870 @2.93Ghz.
All was ok until today, but this morning when we save a project, then close it, and then try to re-open it, we have an error : "Can't open file".
Older projects made with version 0.9 can be open, saved and re-open.
Even a project made last week with 1.0.1 can be open and save as and re-open without any problem.
So the problem is just for the new project of this morning.
We tried to uninstall and re-install photoscan without success.
We tried a small project with only 2 photos, and it is the same problem, we can't re-open it after saving and close.
There is an attachment of a little project for example.
Thanks for helping.