Musescore 2.0.3 text won't save if box highlighted--but looks like it does
In the current stable release of Musescore, if you right-click to Add > Text in a Vertical Frame (probably horizontal too, though I didn't test for that), and you finish typing your text, and then immediately save WITHOUT MOVING FOCUS AWAY FROM THE FRAME--in other words, with the frame still highlighted--the asterisk in the filename tab will vanish. This is the signal that the file have been successfully saved.
BUT IT IS A FALSE SIGNAL. The text does NOT save. If you then immediately close Musescore, say with Alt-F4, because that text was the last change you needed to make, you're hosed. Re-open the file and the text will not be there. The "hidden file" backups are no help because Musescore doesn't ever save the text in the first place.