Yes, each person has their own instapaper address. Remove all of the ones that they told you to add. And just add "@instapaper.com". That will blanket all possible Instapaper emails. Later on, after you are finished troubleshooting, feel free to change it back.
Follow these steps for troubleshooting
1. Send the compilation again
2. Go to the
Instapaper Kindle page and verify that it says "Your last compilation was sent xxx seconds ago"
3. Verify that the beginning of the email on that page corresponds to the beginning at Menu -> Settings -> Device E-mail (on page two)
4. Go to the
Amazon Kindle page and look to the right under the box "Delivery Status for". Under that box, verify that the select menu has the name of your Kindle selected. Check to see if there is "Instapaper-ReadLater-xxxx-xx-xxx" in the same box. If it is there, look at the icon on the left. If it's orange, periodically refresh the page until it turns green.
5. Check the icon on the top-left of your Kindle. Verify that it says WiFi and has at least a few bars.
6. Click Menu -> Sync & Check for Items. It should appear on your Kindle
P.S. I just verified that it works on my Kindle, so Instapaper is not broken (yet)