I'm adding content for another company using a theme made by a third one (already, things are pretty messy as you can guess).
Last week, I was able to create many pages and was about to go on with my work today, but 2-3 things would not work any more: no more images uploaded, and, especially, no more nodes created. You'll have an example with the following GIF.
Assuming I have Project 1, Project 2 (as project content types)
For project 1 there is node 1, 2, 3 (as another content type, lets call it parts content type) etc referencing Project 1 (using node heirarchy module in order to generate menu items automatically based on adding different content types).
I'm having a problem with Drupal 7. We have a site with a fairly large menu (~470 entries) and when changes are attempted via Structure -> Menus -> Main Menu we're finding that those changes are not being saved. We don't get an error message, and nothing is recorded in the recent logs. By painfully slow experimentation (deleting items one at a time) I've found that when enough items are deleted then the menu admin interface will eventually start saving again.