DimStyles - Ambiguous command

When I select "Dimension Linear" and then want to examine the Dim Style via the magnifying glass icon in the Linear Dimensioning tool window, I get an "Ambiguous command" error and nothing happens.  All the DimStyles are defined in a DGNLIB.  If I select the Dim Style via "Element....Dimension Styles", everything works properly; that is, I can examine all the DimStyles and their settings.

 Microstation 08.11.05.17, no vertical apps, Win XP Pro SP3 on Acer VT6800 w/ 2.5Gb RAM

 Decided I'd better do some testing prior to posting, usual workspace component stuff, and yes, it was something in my upf file.  Would anyone like to examine that file for research/confirmation?