So I've noticed some comments that this blank edit screen is still plaguing people (myself included). Here is the quick work around:
- When getting the error and wanting to edit a post with a lot of formatting, hit the "reply with quote" button in the lower right of your post.
- In the quick reply box, all of your text with the included formatting will appear (one quote tag at the beginning and end will be added).
- Select everything, hit copy, and paste it into the blank edit box above.
- Remove the {QUOTE} tags and edit your work where necessary.
- All done? Hit "save" and you're good to go.
*NOTE: If your previously formatted post includes a quote, it will be erased when using "reply with quote". There is no known reason as to why.