I know you will probably curse me for saying this but when you want to go to another paragraph are you pressing "return".
You can also hold "shift" and press return and the cursor should go to the next line rather than paragraph
like so...
I know you are more than likely doing the above but I have to eliminate these possibilities so please bear with me.
Can you use the other settings/options which are available at the top of the editing window (bold, italic bullets etc) ? Or is it simply the paragraph or line return?
Thanks for your patience