Does it shut down immediately with no message?
Or does it "hang" for a lengthy time and finally give you a Windows message that FTM is not working and is do you wan to shut it down. This could mean a memory problem.
Have you done the standard things that you might do when things go awry:
1) Compact the file
2) Exit the program
3) Restart your computer (or shut down and start again)
4) Clear cache