Every time I've upgraded DPA from 6.2 to 6.3 and now 6.3 to 6.4 the web gui never reflects the upgrade. It still shows v6.2.2 in the about.
But on the datastore and agent servers it shows version 6.4 as running.
Is this normal?
Check the installation instructions. There's a note about deleting cookies after your installation to clear a few things up. There's a web applet that manages the version displayed, and I've had to do so every upgrade past 6.0.
Let us know if that helps!