When you scroll down and it streams "Page 2" (for infinite scrolling) the audio posts that use a flash player do not load, but rather instead act as if Flash is not installed. However, some other things that require Flash do work. I would blame Tumblr, which hosts the flash mp3 player, but this problem is specific to WebKit based browsers as Firefox does not have this problem. This would affect any website that would use the same method to have infinite scrolling or anything similar.