After the upgrade from Beta 6 to Beta 7 I am not able to connect to any smb-shares any more. I tried it with a Windows Server, Synology DriveStation and a Debian implementation. I'm directly getting the message Error with connection.
Adding this AppleScript to your Login Items will fix it at login until Apple fixes it:
Code Block do shell script "kextload /System/Library/Extensions/smbfs.kext" user name “name” password “pass” with administrator privileges