AutoCad :: Arial Font Symbols And PDF Plotter - Series Of Boxes Plotted For Each Character

I'm using ACAD LT 2010. I use the basic Arial font for all text and the mtext command to insert text. On occasion I use some of the standard symbols such as the degree symbol (%%d) and +/- symbol (%%p) among others. When I plot to the printer everything prints fine, but when I plot to PDF using the standard DWG to PDF plotter setup that comes with LT2010 the symbols and usually the entire line that the symbol is on either doesn't plot or it plots a series of boxes for each character in that line. I experimented with a couple of other different fonts and the same symbols. Some plotted to PDF correctly others did as stated above.