Hello,
I am not sure but it seems many different errors are happening here. The first one about the WP_Widget is linked to your theme I think, or maybe a specific plugin. It can’t come from WP/LR, I don’t use the WP_Widget in it. Your theme might be, and it doesn’t support the last version of WordPress, this is why.
About the space issue, it’s about memory, not about space. I am not sure why it happens in the formatting.php file, that seems to be when you are editing post or something? When does that error happen? Anyway, your server configuration doesn’t allow enough memory to PHP to do something here.
For the upload issue, there is a strong crash too (is it that memory exhausted as well?). Working on a big image such as the ones you sent might have done that. You might need to allow more memory to your WordPress. Can you try to add the following line in your PHP config?
ini_set(”memory_limit”,”128M”);
You can also ask your hosting service for some help about this error and how to go around it.
Also, I think you should try to change the size of your image just to see if it is because of that (I kind of believe it is). Images of 20mo are a lot for PHP to process, creating the image sizes and all…