Windows 10, by and large, has been a decent addition to the Microsoft OS family.
Apart from isolated glitches and snags which I have encountered, I have to say that I thoroughly enjoy the experience, and it makes things a lot easier when Microsoft release patches and updates that actually fix bugs (Apple could learn a lot here...).
Recently though, Microsoft released an update which has likely caused a bit of confusion.
In cases where a machine has multiple printers installed, Windows now changes default printers whenever it feels the need, or so it seems anyway...
In truth, Windows isn't playing silly buggers with you, but is in fact just sending print jobs to the last used printer, as opposed to the "default" printer.
While this may make sense in some scenarios, there is thankfully a setting to manage this:
Click on the Start Menu (bottom left of the screen), then click on Settings: