Hello aurore,
I think we have found the crash reports from you (although they are not signed) and it seems that they are related to the image format.
Can you please specify, if everything works, when you just add the same photos used in the problematic project to the new chunk, save the project and re-open it?
If the crashes can be reproduced by processing minimal sub-set of images (like 2-5 photos), please provide them to support@agisoft.com, so that we could reproduce the problem on our side and found out the source of the problem.