I am experiencing the same issues,
The extensions are all installed and enabled in extension manager, but do not appear within Dreamweaver CS6 Creative Cloud.
A simple fix is to uninstall the extensions and reboot then reinstall and they appear in Dreamweaver again, but this is a tedious task and can be pretty annoying doing it over and over again.
I first noticed this after a Dreamweaver update but this happened again this morning and no update has been applied.
One additional point worth noting is that the when you activate the products, the version number is undetectable or unidentifiable.
I did message Ray about this when I first encountered the issue at the last update and he was going to get the CC version and try and replicate the problem.
I hope this helps raise awareness of the issue and a fix can soon be implemented.