DraftSight 2011.2.705 worked fine on my Ubuntu 10.10 32 bit. But it told me this version was out of service (or I didn't activated in 30 days? I just don't really know how to explain it in English). Anyway, this version doesn't work anymore when I ran it this evening. 

So I just downloaded the latest version and installed it. The installation was fine.  but when I clicked the DS icon, the logo of DS just showed in the center of the screen for about 0.3 seconds, and then nothing happened!

I just cannot find any method to solve it. Or is it possible to reactivate the older version?