I'm not sure about LJ and feeds. I mostly use the Feedly app on my phone to follow blogs, and that has worked very well for me. Feedly works on my laptop, too, but I have it logged in with the old Meta News account and haven't bothered to figure out how to change it. I read the Tor blog through that and haven't had any trouble getting posts in the last couple of weeks.
There was a point, last year, when the Tor folks overhauled everything and suddenly Feedly wasn't getting posts. As I recall, I had to start a new subscription on Feedly (with the same url!) in order to get around the problem. The old subscription started working again after a couple of weeks. I have no idea at all what happened. So it could be something that Tor did that means the LJ feed isn't connected to the exact right place any longer.
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There was a point, last year, when the Tor folks overhauled everything and suddenly Feedly wasn't getting posts. As I recall, I had to start a new subscription on Feedly (with the same url!) in order to get around the problem. The old subscription started working again after a couple of weeks. I have no idea at all what happened. So it could be something that Tor did that means the LJ feed isn't connected to the exact right place any longer.