No doubt a very simple analogy, but it works for me. Hence, every so often when MARI crashes, you hold your breath as you reload the project file.
Yesterday, this beauty greeted me:
My heart sank, although I had recently exported all my nearly finished diffuse maps from that project. Before importing them back in and starting (almost) over, I tried a simple thing:
Select the broken file in MARI's project overview.
It took MARI a fair while to copy the project, but once it was done, the copy opened as if nothing had happened.
Oh MARI, how do I love thee? Let me count the ways!