DraftSight takes long time to activate or reactivate at Ubuntu

Dear members!

After installing DraftSight at Ubuntu 13.04, setting of Proxy settings and restart the program was start and the registration dialogue was appear. After entering a registration info the program was hang for approx. 5 minutes and was start. The letter was successfully received. After that if Ethernet cable is connected the program hangs every start for approx. 5 min.

What is the reason and how to workaround?

My OS is Ubuntu 13.04 x64.

With best regards.

Viktor.