It happened to me as well, but this time I was posting a youtube video.
At first I thought that it could be that rubiconsdrv is having to watch the video first, but now that
I found this thread, I realize it is happening to many posters.
What happened to me just now is that the youtube video did not show up in my post. And when I went back to edit
so that I could at least add the url so people can access it that way, I found out that even the url
is truncated and distorted, such that it only directs to some youtube home page, and not the video itself!
I mangaged to remove the url, but I'm still waiting for the video to appear on the post.
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edit/add- update: I have found out that the actual URL I was using was truly corrupt and SDC had nothing to do
with the problem. I found a different but similar video and SDC worked well. But what Smersh said about previewing
and waiting several seconds does help during random submitting problems. Try it. Preview the post you are about
to submit first, by using the PREVIEW button instead of the SUBMIT button. Then wait some seconds, allow the
page to load completely, and then actually SUBMIT.