[pstricks] Bug in pstricks update?

[Paul Walker]

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?

Thanks

-----------
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

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://tug.org/pipermail/pstricks/attachments/20180105/17b16ac7/attachment.html>