Can you clarify that, please? I just did a sample and played around with the BB code tags a bit before posting, toggling back and forth between "WYSIWYG" editing and the plain version whilst doing so. Then I posted the message and did a quick edit (again toggling the option in between making slight changes to my BB code tags and such).
Everything seemed fine, but I might not have been trying to do whatever it is that you're encountering issues with, I suppose.
EDIT: I just did another edit, changing the font selection of the word "brown," changing its size, and changing the color from brown to chocolate; again, toggling the "BB Code" option in the midst of making changes. Everything seemed fine (with the exception of that color not looking like "chocolate" to me
). I'll go back and try sienna and, if I don't like that, I'll go with saddlebrown.
Additional EDIT: I did just notice that if I edit a post after the slight time period when there's no "Last edited:" notice attached, and then go back and view the post shortly afterwards... Instead of stating "Last edited: A moment ago," it displays "Last edited: In a moment."
Which left me wondering, "How did it know that I was about to make more changes," LMFAO. Then, a short time later, it switched to (the correct) "...A moment ago." Not a problem, just f*cking weird.