[NTG-context] A problem with Tikz from ConTeXt

I recently posted a problem to the TeX Stack Exchange list, about a problem I was having with Tikz within ConTeXt: http://t.co/qFpMDPA2 The view seems to be that my code is correct, but somehow the version of ConTeXt (or its maths engine pgf) was somehow at fault. Can this be checked in any way? Thanks, Alasdair -- Blog: http://amca01.wordpress.com Web: http://sites.google.com/site/amca01/ Facebook: http://www.facebook.com/alasdair.mcandrew