Great success writing book-like score in 3.1!
I just completed a fairly extensive tutorial ( https://musescore.com/bsg/bwv582_57ff ) in flowing vertical-block paragraphs in MS 3.1 without a single crash or misbehavior (AFAICT). The previous version would crash every fourth or fifth time I adjusted a vertical-block height or pad in the inspector. Those bugs have really been found and fixed, and version 3 is now working really well. Congrats!