The show reply symbol is gone in version 7.0.27943.0. I can no longer view the list of emails I have received and see which ones I have replied to. The message count field is not accurate since it pulls together unrelated messages that happen to have the same Subject: field contents.
eM Client 7 has a new feature called Conversations which groups together message that share a subject. If you go to Menu -> View -> Conversations -> and choose Disable Conversations, the settings should be to your liking.
The “Disable Conversations” fixed both problems. It also fixed a problem where one of my email replies was showing I replied to multiple people when I actually replied only to the sender.