I am running Windows 7 and Draftsight x64.  Older versions of Draftsight worked. Now when I try to start Draftsight, the flash appears for a few seconds and then disappears. I've checked the processes and after the flash disappears, the Draftsight processes stops. There is no error or anything.

I've reactivated twice, I've deleted the Draftsight folder in roaming. No change.