I upgraded my system with busybox 1.19.2 release, and I'm getting the following message when I run crond. crond: NO OPT d! This happens when I uncheck the option "[*] Support option -d to redirect output to stderr". Leaving it checked, it works fine.
Fix: http://busybox.net/downloads/fixes-1.19.2/busybox-1.19.2-crond.patch