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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
I'm sure plenty of others have had this working (had someone posting up with an F4 running 1v72 and 1v75 just a few days ago)... Have you checked the note in red right at the bottom of http://www.espruino.com/Other+Boards ?
This sounds just like that problem - that a saved program from another version of Espruino breaks the newer one. Not an issue on the actual boards because the flasher tends to wipe the saved program.