Rolling back does not help the Muse beta test.
Check to see that your firewall addresses both HTTP and HTTPS connections by Muse. Muse 7 introduced an HTTPS connection.
It can also be an issue with the firewall.
Please try truning off the Firewall and see if it helps.
The preview problem is probably due to either firewall or antivirus software on your computer which is not allowing Muse to make an http connection. That hasn't changed in Beta 7.
New in Beta 7, Muse does now connect to adobe servers at launch time for an AdobeID login, but it seems like you're getting past that ok.
What do you mean by "can't save"? Are the menu items disabled? Does save crash? Does save put up an error alert of some kind?
I've uninstall with Revo-uninstaller..and now i can save again but still can't find a solution for preview mode, but nevermind.. i just export it to HTML then open it.
thank you all for the response