Hi Rill,
thank you for taking the time to test.
Super Alt S should enable speech.
Where the super key is the Windows key for anyone at a later date
reading this mail archive.
Did you have Orca running at time of isntall?
How ever you configure Orca on the live image is how you will get it
installed.
There was a problem on an image where the accessibility profile was not
being copied.
Please tell me the date of your install.
One way to tell easily is by checking the head of your
/etc/apt/sources.list for the date, i.e 20150810 etc.
Thanks
Rob