I have a PRS-T1 and did jackie_w's Calibre tweaks to get the series numbering, thanks by the way, it's very nice. I also see some problems occasionally where the series numbering display disappears from the title. It's usually when I add new books to the device. After the device goes through it's "refresh" or whatever it's doing (rotating arrows in top bar) then the series numbering disappears from the series author line. The fix is to reconnect it to the computer and restart calibre and let it update the metadata then eject.
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