I used Draftsight Mac Beta V1R1.3, everything great!

but today,on startup, it crashes.  the notification shows :

Restore Windows

The application "Draftsight" unexpectedly quit while trying to restore its windows.

Do you want to try to restore its windows again?

I tried to restore its windows but still crashes.

I am using mac OS X 10.7.2

What should I do?

Thanks,