[pstricks] Bug in pstricks update?

Paul Walker psw1959 at yahoo.co.nz
Thu Jan 4 14:20:32 CET 2018

I have just updated MiKTeX and have found that pstricks (31-Dec-2017 build date) now appears to cause a problem. The error message I'm getting is

("C:\Program Files\MiKTeX 2.9\tex\generic\pstricks\pstricks.tex"

! Undefined control sequence.

l.31 \if at check@engine

Not sure what's happening here. If I stop pstricks from being loaded things work ok - apart from the obvious that pstricks doesn't work.

Is there a known problem with the latest pstricks?


Paul Walker
Email: psw1959 at yahoo.co.nz
Blog: https://antidismal.blogspot.co.nz/
SSRN: https://ssrn.com/author=638098
Book: "The Theory of the Firm" - http://tinyurl.com/z2gtcxm

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