Also unable to preview a message, regardless of length or contents.
Also experiencing this. Waiting a few minutes before interacting with the page (in case of lag/slow loading after click the Preview button) doesn't resolve the issue.
i can't send any for a long time, i always get the error message. wasn't it said before the summer that this was fixed? it isn't and that's annoying. functions that don't work are senseless.
[img align=right]http://i.imgur.com/2wJsgJb.gif[/img]