I've got a couple of scripts that I've had scheduled to run in cron for a while. About a week or so ago, they stopped running as far as the (very basic) logging showed, and also I noticed that my wallpaper wasn't being rotated any more.
josh@sirius:~$ crontab -l # m h dom mon dow command 0 * * * * /bin/bash /home/josh/bin/rotate-wallpaper */30 * * * * /bin/bash /home/josh/bin/download-programmes * * * * * echo "I ran" > /home/josh/cronstamp
Neither of the first two commands are run, but the
~/cronstamp file does get created and written to as expected.