Email email@example.com for your file Ref4Q1
Open the file ACA4-01.dwg. What height is the height of text in the "Style courier New" text style?
Text styles are controlled by the Format/Text style dialogue box. (Change menubar from 0 to 1)
Usually when creating a text style, the text height is set to zero. So that any text height can be used in this style.
One area where this can cause a problem is when a dimension style is set to use a text style with a fixed text style height. So when you try to change the overall scale of a dimension the text remains the same height.