Simply put: Jdownloader refuses to initiate after machine crash.

The sequence of events:

1. Updated java to recent version
2. Links gone
3. Uninstalled the latest java and installed "update 21"
4. Links are back! JD seems to be working fine.
5. Adding more links
6. Machine crashes
7. Upon restart, when trying to lauch JD... nothing happens!

Any clues?
What logs/info do you need?