The following and very long post might sound like one of my usual poor jokes, but it isn’t. All it’s true.
Two says ago I was printing with my Maxify MB5150, when a low level warning for the black color appeared on screen. I know by experience that the red X for empty cart would appear shortly and so it did, I proceeded to change the cart in the ‘orthodox’ way. No tricks to replace all the carts at once; only the black. After the customary priming/cleaning cycles, the first nozzle check showed some magenta contamination in the lower cyan stripe. It happens almost every time I change any cartridge, so I ran a cleaning cycle for the color carts and the second nozzle check was perfect.
Until now nothing, surprising you may say. Have patience, the plot twist is coming, but first it must be explained that I usually print in booklet mode : two DINA5 pages are printed on each side of a DINA4 sheet of paper. Thus, a single A4 sheet contains 4 pages of the document. This is set by default in the printer preferences. No need to set it every time I switch on the Maxify
After the cart. change, I resumed the printing job. Only a dozen or so more pages to go. When the first sheet appeared, to my astonishment, A5 pages were scaled up to A4 filling all the paper and only one side was printed.
WTF .I thought, you must have changed some setting in the printer (although I was 99.99% sure that this wasn’t the case).
I cancelled the printing and opened the driver settings. I couldn’t believe my eyes. of the six ‘page format’ settings, ‘booklet’, ‘poster’ and ‘page design’ had disappeared. Not greyed out, just gone. It only remained ‘normal’ ‘scaled’ and ’page design’.
During my long years dealing with computers I’ve seen strange things, but this one must be among the weirdest.
I browsed all the driver settings in all the tabs and nowhere I couldn’t find anything strange, Then I switched to MB5150 connected by USB cable, and everything was correct. No ‘kidnapped’ page format settings.
Being at a loss at what to do, I reinstalled the printer driver, selecting connection by wireless LAN. The ‘new’ Maxify appeared as ‘Canon MB5100 series printer copy’. No nasty surprises. ‘booklet mode’ and all other settings were back in town. I went to printer preferences, changed the name to ‘Canon MB5100-wifi’ and set it as my ‘default’ printer
I haven’t removed from the system the printer with the 'weird' driver. Just renamed it ‘Canon MB5100-limp’

So, now I have 3 different Maxify MB5150 which are physically the same :
MB5100-wifi, MB5100-USB and MB5100-limp.
Wondering if something of this kind has previously happened to any of you.
I still can’t find a possible explanation. It could be that the original driver had been replaced by a generic and downgraded driver?. but where that one came from and why it happened this reversion ?.
I didn’t install any program or change anything anywhere. Just replaced the empty black cart with a refilled one and I resumed printing the rest of the document.
