After careful investigation, it was determined that the problem was not in the software, but in the hardware. The limit switch for the X axis needed attention. After some maintenance, the printer is again functioning normally.
Thanks for the pointer anyway.
So G28 has many different syntaxes. Typically:
By itself homes X,Y,Z axes. Usually you can specify which axis and even say something about calibration:
Above would typically only calibrate X and Y axes. The "0" does nothing on most firmwares but on some tells the printer something about some offest I think.
But there are many other syntaxes. So ask around to people who have the same printer as yourself - maybe your printer type has a forum just like Ultimaker does. Ask there.
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