This is a MWE using \rput in full-page picture to put text to the middle of the page:
\documentclass{article}
\usepackage[paperheight=100mm,paperwidth=100mm,margin=0mm,noheadfoot]{geometry}
\usepackage{pstricks}
\begin{document}
\psset{unit=1mm}
\begin{pspicture}(0,0)(\paperwidth,\paperheight)
\rput[bl](50mm,50mm){abc}
\end{pspicture}
\end{document}
and this is the result:
This was compiled with xelatex on TeXlive 2019.202000218 (as packaged in Ubuntu 20.04). I am quite sure \rput used to work correctly as a more complex document, where this was used, is now broken and used to work (= abc was placed correctly) before the upgrade from Ubuntu 18.04 and related TEXlive packages.
Is there a problem on my side? Is there some fix for this?
Thanks!
PS: compiling via latex → dvips places the text correctly.

xelatex file.tex. Same as few years back when it worked. – eudoxos Sep 12 '20 at 09:02latex -> dvips -> pstopdf. – Bernard Sep 12 '20 at 09:24latexis a no-go. – eudoxos Sep 12 '20 at 09:30\includegraphics? – Bernard Sep 12 '20 at 09:43