Like a stone in my shoe, I've had a frequent problem in AutoCAD where I place a dimension inside an xref window and the text is upside down. Like most, I would try going to Properties and change the text rotation to 180 degrees, thinking that logically that should fix it. As many will know — it doesn’t, and trying 90 degrees, etc., doesn’t work either.
I tried everything. What actually solved it was something under the Properties menu that I had never actually noticed. Under the Text category of the dimension properties, there is a category called Text View Direction. Mine was set at Left to Right, which makes sense.
All I had to do to fix my problem was change that setting to Right to Left, and my dimension text is now not upside down.
Hallelujah, that pain has finally left my posterior, and I offer this tip to relieve it for others.
Notes from Cadalyst tip reviewer R.K. McSwain: Note that this is a good fix in a pinch, but keep what you did in mind if you ever copy this dimension, since the Right to Left text setting is pretty obscure and could have you guessing at some point in the future as to what happened.