I use the program Alfred2, unfortunately it keeps trying to steal the keyboard shortcut CMD+SHIFT+\. How do I stop it from doing so? It conflicts with other apps such as Aperture.
Apparently, one of the workflow hijacked the shortcut. Has nothing to do with Alfred itself.
I don’t think Alfred uses that shortcut by default; that’s being used by 1Password for me. Do you mean CMD+SHIFT+/ (which takes you to the previous path used in the file browser?).
All the keyboard shortcuts that Alfred uses can be customised in the preferences. To get to the preferences, open Alfred, and press CMD+,.
If my guess is correct, then you want to select Features > File Search > Navigation and change the shortcut associated with the Previous Path. Click on the box to the right of that label, and either press a new keyboard shortcut you want to use, or press delete to just unassign CMD+SHIFT+/.
These instructions work in Alfred 2; I don’t have a copy of Alfred 1 to hand so I can’t remember how it works in that version. (And this assumes my guess is right, of course.)