[MartyLK]

Thank you for your reply. Can I ask which music app you are referring to? WMP plays fine on my HD2, but after I stop playing music and mess around with other apps and such, the music doesn't resume when I boot WMP up again. I figure this is normal because there was a plug-in developed for it to allow a resume function.

If the HTC music app performs well for you, can I ask if you drag & drop music files on your card or if you sync music with a specific program?

EDIT -
I figured out the lagginess and issues with the HTC music app. I was using AAC files. I tried some regular MP3 files, sync'd with MediaMonkey, and the HTC music app performs nicely...much better than WMP.

The HTC app should resume where left off. I don't know what playlists are compatible with the HTC app, but the MM playlists I sync'd to it don't show files.