So, after waiting until today (Jan. 8) to try updating pgf for my MikTeX install(s), went ahead and gave it a try (first after backing everything up in my MikTeX root directories).
Install pgf using MikTeX update console. The package information for the update is v. 3.1, build 7 January, 16:11 EST 2019.
However, for any document using some of the PSTricks packages I use, updating pgf causes some compile errors. Here is an mwe, with the error message at the bottom:
\documentclass[12pt,letterpaper,oneside]{article}
%% uncommenting any of the following causes a compile error
% \usepackage{pst-node}
% \usepackage{pstricks-add}
% \usepackage{pst-func}
\begin{document}
here is some text...
\end{document}
If you uncomment any of the PS packages, you get the following error(s) -- here, after uncommenting pst-node:
Command Line: latex.exe --enable-write18 --src "mwe_pgf.tex"
Startup Folder: E:\books\mark2019\misc code\mwe
This is pdfTeX, Version 3.14159265-2.6-1.40.19 (MiKTeX 2.9.6930 64-bit)
entering extended mode
(mwe_pgf.tex
LaTeX2e <2018-12-01>
(<snip>...
(\MikTeX\tex/generic/pstricks\pstricks.tex
(\MikTeX\tex/generic/pstricks\pst-fp.tex
`pst-fp' v0.05, 2010/01/17 (hv))
(\MikTeX\tex/generic/pgf/utilities\pgfutil-common.tex
(C:\Users\egc\Desktop\egc\text\MikTeX\tex/generic/pgf/utilities\pgfutil-
common-lists.tex))
(\MikTeX\tex/generic/pgf/utilities\pgfkeys.code.tex
(\MikTeX\tex/generic/pgf/utilities\pgfkeysfiltered.code.tex))
(\MikTeX\tex/generic/pgf/utilities\pgffor.code.tex
Runaway argument?
] {pgffor.code.tex}
! Paragraph ended before \ProvidesPackageRCS@i was complete.
<to be read again>
\par
l.11
?
Updated pgf now plays nice with tikz (as far as I can tell), but not PSTricks. Which creates an enormous problem for people who use the latter.
If anyone can confirm the issue at their end, I'll post a bug report. Until then, back to the old (but still working) pgf package for me.
