I've just recently discovered this issue in our nagios installation:
A host (with no services) goes down. It remains in 1/10 HARD state, does not page, and does not trigger the event script associated with it. When the host comes back up, it REMAINS in 1/10 HARD state, even though nagios shows it to be ok.
I've found several postings on this forum that seem to be similar, but none of them has solved this issue. Does anyone have any idea why this is happening?