Hi, I'm using OS 10.11. Lately, on my Mac Pro, Mail will not let me edit text I have entered. If I place the cursor in the spot where I want to change/insert text, whatever edit I make shows up about 6 characters before or after the chosen spot. I've taken to composing all my emails in Text Wrangler and pasting the text into my message. This is not happening in any other application. Any ideas much appreciated.