Thanks for letting us know. I hope everyone that gets the update will share the details.
Had my MC15000 upgraded last Thursday. Took it home only to discover it no longer operated properly. When hitting stitch #14, stich #13 displayed; when hitting icon for "settings" the "folder" icon opened; when hitting "X" icon to close current screen, nothing would happen and had to shut off machine. I live in Illinois, USA and luckily we have an excellent dealer. I took the machine back in, they confirmed everything seemed to be "off". They called me stating they spoke w/Janome engineers and had tried to reinstall upgrade twice again but with no improvement to machine's function. Janome told them they were sending a new "B Board" to be installed. Hopefully this will fix the problem.
I hadn't read where anyone had this experience with the upgrade so just wanted to make everyone aware.