What happened to me was that Open ELEC was fiddling with my NFS share for the Thumbnails folder (I share it between 2 XBMC's) and I happened to press "rm -rf *" on the just-mounted-share when I thought I was removing the locally scanned content.
The hack you link appears to be fixing it right now, but I don't think a 'update fanart for entire folder or source' option would be handy: with 52 full series of up to 18 seasons on my NAS I wasn't looking forward to fixing it by hand It's not really a "hack" since a refresh for the whole library is virtually identical to reloading the data for the whole library, as far as XBMC is concerned.
The actions could probably be scripted or set up in such a way that it's triggered by a "refresh library" button, but it would be technically doing the same thing.
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Hello all, I have recently installed Open ELEC 1.0 (1.0.2) [XBMC-Dharma] on my Acer R3700 and am very impressed with the initial features and boot time.