EXS 24 Logic Sampler Users Group

I just spoke to emagic tech support and here's a list of their 
suggestions....

1. Change file types to SDII (they can be converted via Logic's 
Audio window)
2. Change the length of the file names
3. Create a new user account in the OS (could be related to a 
corrupt user profile.
4. Trash Quicktime preferences
5. Verify disk permissions within Disk Utility.

Hope at least one of these suggestions will solve it.