The Metafile image gets converted to a PICT file during the import process. The routines used to draw the rotated text in the Metafile image do not have a Mac counterpart when being converted to a PICT file. One way to avoid this is to export the plot in a different format (PICT, TIFF, etc.). These images do not get passed through a filter when the file is opened and will have the text displayed correctly.
KaleidaGraph is a thoughtfully designed graphing and data analysis application for research scientists, as well as for those in business and engineering fields. It produces publication-quality graphs, and easily converts the most complex data into a functional display.