Beginning with 9.8 SR2 and continuing into 9.9 I have been seeing issues with the font scaling in the Text Comparison window. It seems to be triggered by the mouse pointer interacting with the window. Sometimes the window opens with normal text and sometimes it is way too large, while being wider than it is tall. Moving the mouse pointer in and out of the window sometimes triggers it but not always. Clicking the scrollbars will often trigger this issue as well. Most of the time the text is oversized and this makes it unusable, especially when the size changes and what you wanted to see moves off the edges.