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When I add

-A INPUT -p udp -j DROP

at the end of my INPUT Chain, if I then type iptables -L the list will stop displaying at the drop command.

Before that I am allowing SSH on tcp and some other stuff.

So why does it stop displaying the list?

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perhaps you could provide us exact output so we can actually see what is happening? – alexus Jun 6 '13 at 14:45
up vote 2 down vote accepted

Maybe a DNS lookup is blocking the output - try:

iptables -nL
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lol! of course it does if you block UDP incomming - UDP is used for DNS queries. – Pascal Schmiel Jun 6 '13 at 14:49

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