Tom,
When you reinstalled Hoster, it does not automatically find imported KMA files. You need to rebuild your Songs Database.
1. Run Hoster
2. Click the Help menu, Read Manual command
3. Scroll down to the Table of Contents
4. In the middle colum, towards the bottom read Menus and Commands
5. Click the Rebuild Songs Database link
6. Read how to rebuild your Songs Database
This will get you back up and running.
