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The following happens in about 30 to 50 percent of all trials: Open the properties window for an attribute. Enter some information (mostly I first enter the name of a new attribute called "Unnamed". After leaving the name field, the entire properties window goes away. Clicking on "properties" again gives me an empty properties windows (showing white space instead of lines to enter values). The only remaining way to edit the attribute is doing it directly in the class diagram.
never saw such behavior before, may be because use docked Properties window instead of opening new one so will try. can't reproduce with 6.5, will try 6.1 later but.