We have gotten lots of reports that, even if you are using Rich Text as your default post editor, it still says Invalid Editor type.
The message looks like this
Worry not, as we are already working on a fix for this error, as well as the HTML reblog problems that cause it to happen in the first place.
Until the update is out we strongly advise that you disable Editable Reblogs
It recently came to our attention that entire reblog sections of posts just disappear when viewed on the dash. We traced the issue back to tumblr changing their reblog chain detection yet once again and are currently working on adding a fix to Editable Reblogs to automatically clean this up.
In the meantime we have found a workaround for already affected posts:
Go to the HTML editor and to every link in the reblog chain add
class=‘tumblr_blog’
with SINGLE QUOTES.
Be sure to use single quotes (apostrophes), as Tumblr’s parsing will strip the class out if it has double quotes.
Again, we are working on an Editable Reblogs update shortly which will do this automatically.