Dear Maintainer, Suspecting a bug in psutils. Bug causes tool to die to assert failure, if locale is set. Affects at least fi_FI.UTF-8. Suspecting that affects all that use decimal comma instead of a decimal dot, but this is a guess. Tool fails, when I run a command like 'psnup -p a4 -P a4 -4 < infile.ps > outfile.ps' Tool runs normally, if I change that to 'LC_ALL="C" psnup -p a4 -P a4 -4 < infile.ps > outfile.ps' When the tool fails, there is an assert failure in /usr/lib/python3/dist-packages/psutils/libpaper.py method get_paper_size() and output file is zero size.