Measure Length Tool Is Blank

mstn V8i SS4 v08.11.09.829  w/Win 7

I use the measure length tool all the time to get the total length of several selected lines and linestrings. Beginning today, I can select the elements, open the tool, left click to Accept the selection, and nothing happens. The Boxes for Length and Direction appear grayed out.

I haven't done anything unusual lately except save_as a bunch of dgn's to dwg's using several different Options settings in the save_as dialog.

Is there a setting I should look at?

thanks

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