confirmed not working on a Xen vps where ipv6's not supported. 

The strange thing is, everything seem to work right, ufw status showing it allowing/denying the ports it should allow/deny.

However, when i do "ufw  default deny" everything networkwise is gone (can't ping, dig, wget, apt-get, etc... ) wherewas  "ufw default allow" makes everything work like normal. 

I don't know whether the ipv6 issue causes this, but here's why I think it might:
# /etc/init.d/ufw force-reload 
 * Stopping firewall: ufw...
FATAL: Could not load /lib/modules/2.6.18-53.1.6.el5.028stab053.6/modules.dep: No such file or directory
ip6tables v1.3.8: can't initialize ip6tables table `filter': iptables who? (do you need to insmod?)
Perhaps ip6tables or your kernel needs to be upgraded.
---------------------------------------------------------------------------------------

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 8.04.1
Release:        8.04
Codename:       hardy

------------------------------------------------

ufw --version
ufw 0.16.2.1
-----------------------------------------------
iptables -L -n:
--------------------------------------------
Chain INPUT (policy DROP)
target     prot opt source               destination         
ufw-before-input  all  --  0.0.0.0/0            0.0.0.0/0           
ufw-after-input  all  --  0.0.0.0/0            0.0.0.0/0           

Chain FORWARD (policy DROP)
target     prot opt source               destination         
ufw-before-forward  all  --  0.0.0.0/0            0.0.0.0/0           
ufw-after-forward  all  --  0.0.0.0/0            0.0.0.0/0           

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
ufw-before-output  all  --  0.0.0.0/0            0.0.0.0/0           
ufw-after-output  all  --  0.0.0.0/0            0.0.0.0/0           

Chain ufw-after-forward (1 references)
target     prot opt source               destination         
RETURN     all  --  0.0.0.0/0            0.0.0.0/0           

Chain ufw-after-input (1 references)
target     prot opt source               destination         
RETURN     all  --  0.0.0.0/0            0.0.0.0/0           

Chain ufw-after-output (1 references)
target     prot opt source               destination         
RETURN     all  --  0.0.0.0/0            0.0.0.0/0           

Chain ufw-before-forward (1 references)
target     prot opt source               destination         
ufw-user-forward  all  --  0.0.0.0/0            0.0.0.0/0           
RETURN     all  --  0.0.0.0/0            0.0.0.0/0           

Chain ufw-before-input (1 references)
target     prot opt source               destination         
ufw-user-input  all  --  0.0.0.0/0            0.0.0.0/0           
RETURN     all  --  0.0.0.0/0            0.0.0.0/0           

Chain ufw-before-output (1 references)
target     prot opt source               destination         
ufw-user-output  all  --  0.0.0.0/0            0.0.0.0/0           
RETURN     all  --  0.0.0.0/0            0.0.0.0/0           

Chain ufw-not-local (0 references)
target     prot opt source               destination         

Chain ufw-user-forward (1 references)
target     prot opt source               destination         
RETURN     all  --  0.0.0.0/0            0.0.0.0/0           

Chain ufw-user-input (1 references)
target     prot opt source               destination         
ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           tcp dpt:80 
ACCEPT     udp  --  0.0.0.0/0            0.0.0.0/0           udp dpt:80 
RETURN     all  --  0.0.0.0/0            0.0.0.0/0           

Chain ufw-user-output (1 references)
target     prot opt source               destination         
RETURN     all  --  0.0.0.0/0            0.0.0.0/0