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I have about 1700 rep on SO, meaning I can retag questions without review, but I cannot edit, yet.
I have problem with one specific question (and some other earlier, but I have not reported the problem then):
Daily Cup of WinSCP file Download with todays date
I click Edit link, change the tags, click Save Edits, but I get error message for the main "question" input box, saying "Edits must be at least 6 characters; is there something else to improve in this post?"; and another for Edit Summary, saying "Your edit summary must be at least 10 characters".
It would make sense, if I made small edit inadvertedly in the post. But I did not. I've tried like dozen times. Both in full and mobile version of SO. No luck.
If I specify Edit Summary, I get rid of the latter error message. But I cannot get rid of the first.
I'm not getting the problem when re-tagging with other questions.