OK, for the life of me I cannot duplicate this behaviour with my drawings or the Tutorial drawings in C3D.
Something else I'm not sure about.....and this is probably due to my not using C3D much yet, but the Point display style is set to scale the point by the drawing scale and the text heght for the point label style is set to 0.10"....fine, but the drawing scale is 1"=40' and the Point Text displays at 2.0'....I would expect this to be 4.0, which happens to be what it gets set to when saved out to R2000/2002.
Well, that's all the time I can spend on this today. Sorry I haven't gotten anywhere closer to an answer or workaround.