>>>I get an error replying a message, see attached picture.
>>
>>This probably came after you got a first validation and they clicked again on save. This is a known situation and will be fixed soon. If you do not have a validation and the save is clicked on for the first time, that should work.
>
>Ah, I see it now
>
>it happens if I run into a "wrong tag" error first ...

I never know which tags are allowed, so when I (S here)use and try(/S here) (S here)try and use(/S here) try to use one of those, I get a validation message... and after a few retries (using STRIKE instead of S, then [] instead of lt and gt) I rewrite the message to have no tags at all but it still won't get through. I usually put the whole text of the textarea on clipboard and simply reply again.

Easy and works, at least until that's fixed.