Musescore 3.x not useable?

I've had to uninstall MuseScore 3 from my Windows 10 system due to its tendency to mangle scores created with older versions i.e. almost all existing scores! For example, Beautiful Love, https://musescore.com/user/9317671/scores/5133123, opens as expected in MS2.3.2 but in MS3.x the lyrics and title text are reduced to an unreadable size and don't appear to be editable. Other negative features encountered include global changes not being honoured e.g. changing Chord Symbol text and position. I find it hard to believe there's so much wrong with 3.x - is it just my system? (2.3.2 is still working perfectly)