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"I had to do step 6 before I could do step 5" - Same for me! On mathematica.stackexchange.com i asked pretty much this question. Very fast somebody linked me to a 20 days older similar question that was asked, where someone answered he had had...
After upgrading Windows 7 to Windows 10, Mathematica 10.2.0 developed this same problem. I reset the configuration as suggested and it helped reduce some of the excess freezing and crashing, but the "Formatting Notebook Contents" message still...