Preview gone

[nader]

ok still running S4 4.3.24  working on song and i save the preview 3 times with different names. saved all when i closed the program out when i was done for the night.

started up PE and all my previews are gone. and it gives me the start up window like i just started the program from day 1.  Good thing i have all my songs backed up in a different folder going back years.

I already deleted and reinstalled s4 the last version. not ready for s5 after this year i go to s5. Just need to know why it lost the previews. will start over.