I too am having an issue with snippets.
Initially, after installing Alfred 3 this morning (loving it btw), I was not able to get snippets to work at all, even after allowing accessibility to the Text Service.
HOWEVER, after quitting Alfred and starting the app again, the snippets are at least being recognized. If I type a keyword, the text is properly detected and removed, but nothing is put in its place, it simply disappears. THIS functionality is happening in all my other applications so it doesn't seem to be app specific either.
Also, sometimes, but not always, an error sound plays after the replacement. This happens in the URL bar for instance, but not in this forum form for some reason
Any help would be greatly appreciated!
http://screencast.com/t/LZ4skGs2V7