Since updating to v0.4 Bugless Beast on my Motorola Droid I have had issues with being able to access photos in gallery and audio files in the music app. Some pictures or albums will appear in their respective app but not all of them. I've tried other custom froyo ROMs and have the same issue.
Thinking something was wrong with my SD card I formatted it and double checked the folder structure. /Media/Music and /DCIM/Camera/ seems to be correct. I'm also having trouble with the phone not seeing ringtones or notifications placed on my SD card as well. I did not have this problem when using stock 2.1 Eclair.
I always wipe the cache too when flashing. I've also tried SDRescan but I didn't have any effect.