I have noticed that unit icons (portraits) sometimes are not place in the region in which they should be.
I have the d patch installed. I have been playing the Austerlitz campaign as the French and have noticed this numerous times.
Napoleon starts in Strasbourg, but his icon appears in Grenoble (as well as all the other corps that start with him). I have not moved him there, and the tool tip text shows his current location as Strasbourg. I have allso seen his icon located in the middle of the Alps, while he was located at Ulm.
I have an ATI 1950XTX, if that is relevant.
It doesn't help to learn the game (which is difficult enough) with units appearing to be in locations when they aren't there.