*solved* Cura wanting to save instead of print

*** Update***

There was a problem with the USB cable; as part of troubleshooting, one of the things I tried was replacing the USB cable, and that immediately resolved it. Putting the duff one back on caused the error to return, so presumably it lost the ability to talk properly to the printer

Guys, Cura has started to behave very strangely - now, when you click on file, print, or on what used to be the ‘control’ button, it now comes up with Save G-Code. I’ve restarted the PC, Cura and the printer, to no avail

What have I messed up?

Uninstalled and re-installed Cura as well, no help