I have windows 7 64 bit. I have made a new installation of Openmodelica and a new installation and verification of Java 7. Running an OMN-file  from feb 2012 in OMNnotebook. The simulation works and data is stored as it should on *.mat format. It is possible to plot the generated data in Matlab.
Problem: The plot command in OMN notebook does not give any result.