Is replication enabled? Open -> Replication and Sync. Is replication showing for any databases? What is the 'next' replication time (shown on the bottom of the page).
Go to File -> Preferences - Replication and sync. Does that show that replication is enabled?
If you just installed 9.0.1, did you also install Fixpack 2 (FP2) ? Although I don't know of any specific replication issues without it, or fixed by FP2, it usually doesn't hurt to install all updates that are available when upgrading.