Beta 2.19 <Ctrl-Z> returns to start of staff after changing font
I'm not certain, but I think this behaviour is new... It is certainly unwelcome.
If you place a text object and select a font - normal or user, doesn't matter, then go into page setup to change the font - maybe it's too small, or you want to specify a different typeface - whatever - and then discover you've made a bad selection and press <Ctrl-Z> the insertion point moves to the start of the staff.
I'm sure it used to stay at the current location and you could see the effect of <Ctrl-Z> and <Ctrl-Y> without having to search for it.