I've been having this problem with Canola from the first install. Canola scans and finds my directories with no problem at all; and it shows me my photos, no problem. But it will not play .mp3 files in the music app, nor will it play .mp4 videos in the video player. They are all playable in the stock media player. All are in folders on my internal memory card, which is an 8G SDHC. They simply sit there loading forever. I've a 1G SD card in the external slot, would they play from there, perhaps?