Dimension document won't load past 90%

Hi I created a scene in Dimension and now I need to change color but it is stuck at 90%.. Is there an easy fix or do I need to start all over again. It's frustrating it's been doing this a lot lately and I always get the same error message while saving and am never able to open back my renderings. I don't want to redo the whole thing but I need to get this project done no matter what.

Thanks,

S