Score submission seems to be delayed at the moment.
Also a few people have their scores completely fail to submit (with the error pop-up) at #help.
Not much you can do for now. Wait it out and keep an eye on http://stat.ppy.sh/ and https://twitter.com/osustatus
Edit:
Also don't close your client if your scores aren't submitting, as it will automatically try to re-submit scores that failed to submit for about 3 hours.
Furthermore check your profile under 'Historical'. If the play is in there it submitted. Otherwise it didn't (yet).
Also a few people have their scores completely fail to submit (with the error pop-up) at #help.
Not much you can do for now. Wait it out and keep an eye on http://stat.ppy.sh/ and https://twitter.com/osustatus
Edit:
Also don't close your client if your scores aren't submitting, as it will automatically try to re-submit scores that failed to submit for about 3 hours.
Furthermore check your profile under 'Historical'. If the play is in there it submitted. Otherwise it didn't (yet).