D-Link DIR-655 :: Internal Port Blocking / Routing?

Have a Rev. B1 w/207NA on Time Warner with a Moto Surfboard SB5150.Working with TiVo's, we've been through hell and back trying to resolve why Multi Room Viewing doesn't seem to want to work - but only one way!  The newest TiVo's their Premiere model with HD and all the bells and whistles, it sees the other TiVo and all the other software that can send programs back and forth with it.

I brought on a Series 2, which is an older model that's non HD and has some older software in it.  While the Premiere and the other PC's/Software around the building's network can 'see' the Series 2 and it can 'see' the other shared PC's, etc. the thing can't 'see' the Premiere.This has been going on for awhile, I've worked with TiVo Support also to unlock ports, IP addresses and anything else we could think of.  Still no luck.  Then we had a strange occurance!

The DIR-655 seemed to 'lock up' or disconnect from the Net.  One day I was surfing the Now Playing menu in the Series 2 and the other TiVo wasn't showing as usual.  I checked it again during a commercial for something totally different and suddenly noticed there it was!!  I thought it was weird, so I went out front to check with the person using the main TiVo if they had made any changes or done anything - they hadn't, but did mention their Net connection was gone.

I turned around and looked at the 655's status lights and noticed while all the rest were fine - the WAN/Net status light was totally out.  Not a single blink.  And then I looked at the Moto cable modem and noticed it's 'activity' light was also totally dormant.  I twisted the Moto to get a better look at it and things started working again, I tightened the cable modem cable on the rear and that was it.

From that point on - once again, the front TiVo won't show on the back TiVo!  Does every other way, but not that.  In our discussions on TiVo we thought it could've been the cable modem firewall or something, but I retested it and this time it had NO effect.  Tried not only taking out the cable-cable but the Ethernet cable as well to ensure all were tested.  Still didn't now up.  What I thought was going on was the 655 had turned into a giant 'Hub', which would've caused the TiVo's to use their old-fashioned Beacon software to 'find' each other.  When the 655 software kicked back in from that glitch, the hub setup would've obviously stopped and the 655's software settings would've kicked back in.

I have a complete list of the ports internally that need to be open for those two TiVo's to communicate, but I can't find anything in the 2.07NA GUI (or Help manuals) that tell me how to write a rule to open those ports internally.  I wouldn't think there's any internal blocking or firewalling going on (I have it set to allow communications between clients on the internal Net) but there's so many settings in this GUI it makes your head spin!