Try again now, there have been some updates to the extension today. You should see (at least) the version 5.0.3 in your chrome extension settings:
chrome://extensions/?id=ammjpmhgckkpcamddpolhchgomcojkle (can copy and paste this into your browser bar to quickly get there)
Worst case if you don't mind, click Destroy Scatter and start over importing your private key again and then using it to look up your EOS account in the Identities section.