Streaming Problem - incomplete over ethernet

Hi there,
I have a problem with the streaming over ethernet from my Intel iMac, connected by ethernet to my Netgear WGR614v6 router, to my AppleTV (also connected to the router by ethernet).
My iTunes library is around 120 GBs so I have chosen to stream the majority of my content and only sync the content that I cannot stream (photos). Most of my streaming seems to be OK but bizarrely there are a couple of items that I have updated in my iTunes Library that are not reflected on the AppleTV. These appear to be quite random and are not related (as far as I am aware) to problems with encoding.
Basically I have a podcast subscription which I cancelled in my iTunes library which still appears on my AppleTV, I have a home movie (originally on VCD) in my iTunes Library which is not appearing on the AppleTV and I also have a couple of albums (encoded as VBR 250kbps .mp3 files) that are not appearing on the AppleTV.
I have re-booted the iMac various times and done 2 factory restores of my AppleTV. Is there anything else I can do? Somehow I think the AppleTV just needs to be forced to re-examine the contents of my iTunes library?
Any help or tips much appreciated.
regards
Raf

Dear Winston and capaho - thanks for your quick responses.
ROUTER - I did see some posts about issues with Netgear routers but they were all related to wireless connectivity issues. I am having no problems at all with streaming at sufficient rates and I imagine that issues with Linksys and Netgear routers pop up frequently because they seem to be ubiquitous devices for home users.
FILE DELETION - I did check that the podcast from which I had unsubscribed really was deleted (and it was indeed gone) and I did check that the albums and home movie (.mp4 file as are all of my other movie files) was indeed present in my library.
ITUNES LIBRARY.XML - I have identified this as the root of my problems because this .xml file still contains references to the old deleted podcast files and it does not contain references to the media I am missing.
It appears that iTunes Library.xml corruption is a very common problem (seeing the number of posts on the "using iTunes for Mac" forum) and that is the source of my problem.
Now to do some testing!
thanks again
Raf
UPDATE: I quit iTunes, backed up and then deleted the .xml file from my "Music" folder in Mac OS X. When I next started iTunes it created a new .xml and this seemed to do the trick!
Message was edited by: Rafael Sanchez

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Message was edited by: Charles266

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