Fonts resizing while trying to edit

Sorry all - I did a search using "Fonts" as a keyword and found all kinds of related topics that do not answer my question.
Here is my problem: I am continiously trying to edit various text items and everytime I put my cursor in the text it resizes a different (smaller?) size. So I select all the text and change the size. When I preview it it is not what I thought I was looking at while editing. This is extremely frustrating.
From trial and error experimenting, I have found that the problem seems to be minimized i.e. not be as much of an issue, when I edit at 100% magnification.  
Is that the only solution or am I doing something wrong?

4 Replies