I Can't Write or Edit Posts

Hi!

(I wrote about this issue recently and got some help which I thought had solved the problem, but sadly not.)

I’ve been having real problems with writing and editing posts for about a week. The present form of this problem is that if I’m in the dashboard and click on either Add Post or Add Page, I’m taken the the Add New Post/Screen, but the place where I would ordinarily write things there is just a big empty box. The cursor doesn’t appear in it so I can’t type anything.

Similarly, if I go to one of my existing posts or pages, I can’t see anything in the white box where my post should ordinarily be, so I can’t edit it. The post can still be seen by visitors to my site, however.

I can never see my post in the Advanced Layout Editor mode, but occasionally I can see it in Default Editor Mode. If I then try switching to Advanced Editor Mode the post disappears again. Switching back to Default Editor Mode after this doesn’t bring the post back again.

I’m sorry if my description is a bit confusing, but it’s a complicated situation to try to explain. I’m afraid it’s causing me a great deal of worry so I’d very much appreciate any help you could give.

Incidentally, I’ve tried disconnecting all plug-ins and also I haven’t added any code of my own to anything. (I wouldn’t know where to start.)

Thank you very much for your help.

SIJH