I have a board that I would like to be able to read the terminal labels on both sides.  During the PCB layout, I add the text to the top and bottom silkscreen layers.  The top layer works fine, the bottom layer appears mirrored in the PCB editor - which makes sense.  However, when I use the Gerber viewer the text on the bottom layer still shows up as mirrored even when I look at the bottom view.  I have tested the same Gerber files on other viewers and the bottom side text shows up correctly, there must be a bug with the Gerber viewer.