I have an answer to my issue, but not a thorough understanding. It relates back to an issue I had with RTF font appearances when I upgraded to DT4 back in August. RTF font format appearance changed with DT4 Upgrade
I duplicated my current issue. And as previously, the font shrunk after I added an image then closed and opened the RTF. Then I remembered my previous post, dealing with persistence of the zoom setting for RTF’s. That when you change the Zoom setting for RTF’s, it doesn’t just change the document you are editing. The new zoom setting is applied automatically to all subsequent RTFs
So, back to my current issue. With my small font RTF open, I Zoomed in using View>Zoom>IN until the small font had increased to a comfortable reading size. I then closed and opened the RTF and the increased font appearance persisted. I then created a new RTF and dropped a screenshot into it. Then closed and reopened the RTF. All was fine, the text appearance stayed the same and so I believe I’ve corrected my problem, but I don’t feel it’s fixed because I don’t understand the cause of the change.
If the zoom setting is persistent, and if I had inadvertently changed the zoom setting, then it seems to me that all subsequent new RTF’s should have started out with the tiny text and I would have recognized it right away.
Note:I can replicate the tiny font with View>Zoom>Actual Size. And get to a readable size with 3 Zoom IN commands. But I haven’t been able to find the current zoom level setting - just that I can see the font comfortably.
Perhaps after I’d added the image to the file and reopened it, DT4 used the Actual Size zoom setting for the modified RTF rather than my default zoom.