What causes a thread subject to change from Bold to regular font?

The "envelope" icons at the left of the page show "unread posts" for every thread, yet only the first two (non-sticky) threads are in bold font.
Most of Perb is un-bolded for me today, even though I've taken a few days away, and the sight is full of new posts.
Thanks in advance!
The "envelope" icons at the left of the page show "unread posts" for every thread, yet only the first two (non-sticky) threads are in bold font.
Most of Perb is un-bolded for me today, even though I've taken a few days away, and the sight is full of new posts.
Thanks in advance!
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