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As no one seems to able to help I've used a workaround using
Thanks to all who read

I am attempting to produce an arrow half way along a loop. I can produce an arrow half way along a line, but how can I get the arrow in the middle of the loop?

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows,decorations.markings}

\begin{document}

\begin{tikzpicture}[scale=1 ...

Thanks Elke. That fixed it

I am trying to produce framed definition theorems etc. It works well if I use the documentclass book, but not if I use amsbook (the latter sorts out page numbering problems)

The problem is that no space appears between the boxed definition and the text. Can anyone help?

\documentclass[a4paper ...

Thanks Thorsten. I realize that now. I mistakenly installed PSTricks with synaptic and that downloaded some TeX Live 2009 files. I've now sorted that but will have to have another try with PSTricks.

Thanks Stefan

I have attached the log file as you requested

Thanks Stefan. I can't understand it because I have TeX Live 2012 and I downloaded pstricks this morning

I have installed pstricks on Ubuntu with TeX Live.

When I try to compile this simple document.
\documentclass{article}
\usepackage{pstricks}

\begin{document}
\psdots(1,1)
\end{document}

I get the error
! Undefined control sequence.
l.5 \psdots
(1,1)

Can someone suggest a solution?

I have installed TeXnicCenter v1.0 and Sumatra V 2.1.1

I have updated the TeXnicCenter according to
http://kent.dl.sourceforge.net/project/texniccenter/Tutorials/How_to_Sumatra_EN_%282010.03.07%29.pdf
to set up forward search

The forward search works fine, but if I run 'Build and view' with no ...

Thank you localghost

I apologise for causing your ire; I really did not see the difference. I do now and appreciate your help