MTEXT editor?

When I attempt to edit mtext using the mtext editor I select the text I wish
to edit in the editor and then start to type new text. When I do this the
character changes font to "tahoma". Thhis is not the font of the text that I
am trying to edit nor is it the current text style. This only began to
happen lately.
I am running r2002 on xp professional.
Any Ideas? Thx!