One of my counterparts had a problem today with a drawing he had saved last week. He had adjusted the width of literally hundreds of pieces of mtext to fit between some detail lines. When he opened the drawing this morning, all of the widths of his text boxes were very narrow and text was all over the place.
The culprit was his MTEXTCOLUMN system variable was set to 2 where it should be set to 0. It was always trying to make columns in his text. You want your mtext toolbar to look like this: