I have an issue where my projects seem to become corrupt and cannot be opened anymore. On several occasions I have run a 4500 image project that takes 2 days to process, only to find that once I close Drone2Map and try to open it again, my project won't open. When I try to open the project from the menu on the left (Open), the program freezes for a while, then goes back to an empty project. I have lost several days of processing time because of this issue.
are you opening a project in ArcMap with all that imagery? I presume you have processed results that are still available, can they be added to a new project singlely?