with sage it works -
but i would not say that other rss readers are nonconformant
it looks like Nightly Builds feed is only working with sage ...
have you tried with others ?
why do others not have any problems with almost all other feeds available in the internet ?
( just ideas )
sage is a little bit too small for my needs, it can't autoreload feeds,
doesn't save read/unread items settings over sessions ... [edit] obviously not true
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i don't like to use it