Image Editing Issues & no "Back" button after new WP Update

Hi,
I’m having a weird issue with the image editor that I haven’t seen mentioned elsewhere. I can upload photos fine, I can see them fine, I can insert them into the text, and I can even edit them in terms of the size of the image.

But my problem is that the minute I edit them (ie, cropping or scaling a photo), I can’t insert it into the text. And there is no “Back” button to return to the main Media Library page. It’s as if I’m stuck there because I can’t use the Image/Media section at all. The real problem, I guess, is that the usual “Back” button is gone and the insertion feature doesn’t work.

In order to be able to get back to the Media Library page and to insert/use any photos, I have to close the editor and save the document. Only then can I use the Media Library properly and insert the (now-edited) image.

It’s a real pain that adds a huge amount of time to everything I post. Seriously, maybe an hour a post because I use a lot of photos, so I’m constantly getting stuck, having to save, and having go back to use each image.

So, this is what I’ve done up to now after reading some of the forum posts: I’ve updated all plug-ins like Jetpack, Yost, Akismet, and my theme, and I cleaned my browser cache. (If it’s relevant, I always use Chrome.)

I don’t think it’s the plug-ins, because all my Media, Uploading, Text, Writing, Posting, Preview functions work fine. It’s just the insertion and “back” part of WP’s Media Library’s editing function.

I have ZERO knowledge about coding, tech stuff, and FTP whatever. One WP 4.5 Support document I read talked about deleting plug-ins, then reinstalling or whatever, and that terrifies me. I can’t do any of that by myself. I wouldn’t know where to begin or how to do it.

Can anyone help me in a way that doesn’t require me tinkering with codes and all that stuff? Is there any way a WP Support person can go into the nuts and bolts of my set-up to fix whatever minor coding issue is doing this?

My website is: https://www.KafkaesqueBlog.com

Thank you in advance for any help that you can offer. (I really hope the advice or solution is *not* to delete/re-install my plug-ins, because I won’t be able to do anything and I’ll be forced to hope that WP eventually issues a bug-fix.) :'( :'(