I don't know that there is a specific reason why you don't see posts, Pete, but I suspect that there are possibly dozens of reasons why some messages don't look like they've made it out onto any network.
This hack/spitWindows machine and newsreader (and my previous machines using windows) routinely miss picking up posts and replies.
If my machine is off for a day, I won't see posts from that day unless I go check the Goog RCM postings. I know this isn't operating properly, don't know why, and get a little crazy(ier) trying to figure out software issues, especially when retreiving messages from a network should be a very simple operation. I'm not interested in wasting another second of my time trying to find out why this crap doesn't work.
I've seen news articles that stated that about 1M homes are without electrical power in the past few days, and I would assume that some networks have had interruptions, too.
Someone mentioned that they may not see their posts for a long as 30 minutes, as though they meant that they alwas see them, but sometimes with a delay.
I've posted messages that just seem to evaporate, never to be seen. Other times, the Send hiccups and makes two identical posts.
The most reliable method I know of, to see if a message/post makes it to the upper levels is to check the Goog RCM postings.
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If you put your name/ID in the Author space, and rec.crafts.metalworking in the Group space, and choose a specific period of time in the Message Dates space, you might then be able to save a shortcut to those results.
Lately, I've been making a shortcut to show all my postings and replies for the first thru the last day of each month. That allows me to see if I miss replies, and gives me the opportunity to thank someone for their reply, when I would normally not know that they had offered some help.
I know two guys that have the Eden type heaters, and I agree the makers are deceptive, but it's anything for a buck these days, and any way that buck can be gotten seems to SOP anymore.
It's about the same as the bullshit marketing that was used to sell thermal windows with the pitch that they would pay for themselves. New windows can be very leaky and still qualify for the Energy star and other ratings/approvals.