I'm joining other posters here afflicted with the no space between paragraphs dilemma. (I'm using the "Redoable Lite" theme.)
I've read some solutions that suggest switching to plain text, to an external text editor, to editing code... but those are not, in my opinion, acceptable solutions to solving what is a very basic word processing function that has been around since I taught at IBM a hundred years ago.
I'll be writing to WP Support when it's not down and asking when they are planning on fixing this, and hopefully, it will be soon.
Apologies if this post sounds terse, but ongoing frustration is seeping through and I haven't had enough coffee this morning...