I added and edited many categories till now.
But when I tried to add one more category today, I received the wrong screen and nothing was done - see the attachment img file. categories.jpg
The same screen now, if I'm trying to edit any category.
This case took place, when catid=3375 was assigned to latest created category and I tried to add one more category.
Now I can do nothing with categories
Are there too many categories?
PP version 5.21