Newbie question: Why aren't my cron jobs running?

[Mark Felder]

On Tue, 12 Jun 2012 00:06:21 -0500, Robert Bonomi  
<bonomi at mail.r-bonomi.com> wrote:

> Comment: using a leading zero on the numeric fields is a BAD IDEA(tm) --  
> you
> are *strongly* encocuraged to remove them.  Yes, that means numbers will  
> not
> be column aligned, but it is a small price to pay to avoid the  
> hair-tearing
> that =will= ensue when using it bites you.

Any other info on this? I've never heard of this before and I've never  
seen an issue using leading zeroes on the minutes value.