Thanks for the response. Again, I'm afraid I wasn't clear enough. It's not that the minibuffer is automatically growing to fit the information display - that would make sense to me. The problem I'm having is that the minibuffer is growing to two lines for no apparent reason. There is plenty of room left on the line. The only thing I've noticed is that the lines in the agenda that do cause the minibuffer to grow each are 4th level headings (i.e. the minibuffer is showing up to the 3rd level heading). So far, that's the only thing I've seen that they have in common. The minibuffer grows to two lines on those particular items and shrinks back to one line when the cursor is moved to the next or previous line. It's the growing, shrinking, growing thing that is annoying.
-ED-