[orca-list] Orca doesn't start at login

[Jordy Deweer <jordydeweer gmail com>]

Hello everybody,
I've a little problem.When I log in onto my local account on my Debian 
pc, Orca doesn't start automatically. On the GDM3-window, it does his 
work well, but when I com onto my Mate environment, I should start Orca 
manually.
I must do this as follows, because Mate isn't using the Alt-Super-S 
keystroke:
First I open the Run-dialog (Alt-F2). Then I type just the word orca and 
press the ENTER-key. After this, Orca is running. But if I log out, or 
if I restart my pc, Orca doesn't start when I log into my account! I 
should repeat the steps that I described before!
How can I solve that very strange problem as simple and fast as possible?
Thanks for the answer!
Regards, Jordy
Distribution: Debian
Version: 8.4 Jessie
Desktop: Mate because I can't update gnome to the latest version
Orca-version: Orca 3.20.0, installed from source. That went well!