XnView is a wonderful program, but recently I've come across a bug that is quite annoying (at least if you are impatient

First I thought there mightn't be any thumbnails embedded in Oly E510 RAWs. But strangely, with some (rare) RAWs it works, and XnView detects the embedded thumbnails. Also, other viewers like zoner don't have any problems and generate the previews extremely fast - no matter if I browse jpgs or RAWs.
You can find examples of Oly E510 RAWs here:
http://www.reisefotos-web.de/Test/Rawfile.ORF
or here:
http://raw.fotosite.pl/
Cheers,
Frank