If you’re using pstricks-add or a package requiring it consider updating it if its version is lower than 3.34. The version 3.34 has been released some days ago and brings a bugfix for the \pstScalePoints macro. The bug could look like the one discussed today in “problem with pstricks and \psset” on LaTeX-Community.org where v3.32 has been used.

Further the macro \psMatrixPlot has been modified in v3.34 and is now able to plot a matrix of n² values as an intensity plot.