Going to resurrect this to for some clarification. Every media player I've ever used has a theoretical upper limit to the number of songs it can deal with at a time. It varies from player to player. Most are not that forthcoming about that number. Not that they're really hiding it either, though. A theoretical number and an actual are effectively never the same thing. The most obvious limiting factor is RAM. With most modern systems that really isn't much of an issue any more. By modern, by the way, I mean 4+ GB RAM. Still, when dealing with 10,000's of thousands of files, something could easily slow down. Neither my laptop nor desktop had any issue dealing with my ~15,000 music files. Add another 10,000 or so and I wouldn't be surprised by a bit of odd behavior.