[other] missing/invisible files

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http://ubuntuforums.org – ok I just got some photos off my camera to sell some stuff on ebay. But when I go to add the photos to the listing they are missing. Photos and thumbnails are present in the file manager, but absent from within firefox. Restarting the browser makes no difference. Other photos are there, just not recent ones. Is this a firefox problem? Surely the browser shouldn't be remembering what used to be in the folder? I am running xbmcbuntu 11 (Hardware)