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It's likely many "special characters" that are the issue. It'll eventually get fixed. However I've only noticed the enya thus far. at least you have an idea of what it is. and it's probably not to do with images but actual text, or copied text.

I still have the same problem, finally did a test post via my steempress, but can't edit it...

the solution for me was in: https://steemit.com/news/@kubrickkk/missing-posting-authority
comment by ace108

was the tags, not copy but type them

Hmmm.... There is probably some kind of character you are either copying in or using that's likely causing it.