Thanks lot for the information, guys. At least I can stop searching, now. Yes, sorry, I was blind initially. During my search yesterday I have found the other discussions on that topic. There seems to be a little "war" between people that prefer fixed page numbers and those that prefer flexible page numbers. My side seems to be the loosing side. But I haven't found the info you just provided on the firmeware change, thx.
I am not using epubor, btw. Just stumbled over that page when googling for my problem. I have removed the link, now, in order to not direct people there.
The word count plugin is an old and trusty friend of mine