ARD through Hamachi - Problem

Hi,
I am successfully using ARD 3.1 over Hamachi mostly without problems except one big one. While I can access all options from 'office' to 'home', I cannot observe or control from 'home' to 'office'. All firewall ports (3283 & 5900) were opened on the routers, though I realized later this is not necessary when going through Hamachi, and software firewalls are off.
I can send messages and get reports from 'home' to 'office' so I know the password and username are entered correctly. It even shows current application, user and idle times correctly. Through Finder I can connect and access all files back and forth with no problems from either side.
The only difference I can see is the 'home' router is setup through DHCP and runs through a cable connection. The 'office' router is setup with PPPoE because that seems to be the only way to operate it with Verizon DSL.
Any clue what might be the cause?
Thanks,
Mike
G4 iMac   Mac OS X (10.4.8)  

More information:
I turns out I cannot observe this desktop from any machine, even within my own LAN. So even with all the software firewalls turned off, I still get 'authentication errors' when I try to observe/control. Other functions (reports, messages, etc) do work within the LAN as they also do through Hamachi.
It seems this is not a firewall/internet access issue at all but some kind of bug in ARD? No other VNC clients are running in the background. I have even fully removed then reinstalled ARD on this machine. Could there be a residual file that is causing this?
The only thing I remember doing that I seemed unsure of was updating from 3.0 to 3.1 from 'home' on the 'office' machine. When I reinstalled, it seemed that the files from the 3.1 update were still in the machine. Is there a way to remove those, remove ARD and reinstall both again?
Please help!
Mike

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