Just wanted to let people know because I'm sure you're getting the same thing...
I've been getting emails in stages. 1st, they email to say "application received", 2nd they email to say "your application is not complete because it is missing your transcript" (but transcripts were sent about a week ago), 3rd they email to say "Your application is complete" once everything processes.
Thus, if you get an "application not complete" email, but you know that your school sent the transcript a few days to a week before, give it some time. If your school sent the transcript over a week ago, you might want to double check.
Also, this tidbit from Penn:
The review process will begin in late June and could take several weeks, although you may receive a decision much sooner.