Having problem viewing my music

I added music to my new Sansa Clip, then added more music a few days later.  I can plug my Clip into my USB and click to view the music in Explorer and it only shows up the music that I added last.  I opened up WMP and it also only shows the latest music I added.  I can turn on my Clip and listen to all the original music.  What’s happening with this and why can’t I view ALL my music?  Help please someone!

Thank you for your reply - I certainly appreciate your help.  Would I sound too much like an ■■■■■ to ask what the difference is in this MTP and MSC mode? I read the user manual and it didn’t seem to explain much.  Thanks again!!!

Simple breakdown: in MTP the files are managed through Windows Media Player, and MSC the Clip is shown in My Computer as another removeable memory device.

Message Edited by Mushroom on 06-26-2008 07:25 PM

Well, how simple is that?  Thanks for answering my questions.  I’ve already gotten everything switched to one mode and hopefully this won’t ever happen again!