Others have shared that they are experiencing the same issue that I am experiencing. I will be working on a project, and it will work fine with no apparent issues, no kind of lag or such.  I stop and save the project. When I come back to start it up, the file starts to load normally, but just before completing, it stops and up pops the message "Failed to load file". 

This has happened repeatedly, with smaller project files as well as larger ones. It is difficult to figure out a common thread. I updated my Nvidia drivers, and I thought that helped, but then the issue started cropping up again. 

At one point I thought that the problem was possibly associated with using some old legacy animations, but even after I stopped using them, I continue to get the problem (though less often) 

It is extremely annoying to lose this work over and over. I have tried to compensate by only doing very brief projects with just a few seconds of animation, rendering that, then saving a version of the project with all the animation removed. But it's a pain in the neck, and piles up all these extra project files. 

I do think there is some issue with the way Iclone 8 saves animations that may be causing this "Failed to load file" issue.   The difference in size between project files saved with animations and the same one saved without animation is often much, much greater. 

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75% of original size (was 667x19) - Click to enlarge