Procmail has stopped working

I am a new user of procmail, so I don’t really understand much about it… I made some recipes to filter spam (I installed spamassassin 3.1.7 as a local copy) and it was working really well. But today I was fiddling around, and suddenly it stopped working - nothing gets filtered at all, and there is nothing in my procmail log since it stopped working. My ~/.procmailrc file is:

Can anyone see what is wrong?