Program Locking

Hello!

My DraftSight (version 2015 BETA) is locking with any file that I open. My video card is with the latest version of the drives. In my analysis I realized that the program is using only one processor core. Is this the problem? How I solve it?

Processor: Intel Core i7-2630QM

Clock: 2.00GHz

Memory: 8GB DDR3

Video Card: Nvidia GForce GTX560M

OS: Ubuntu 64bit 14.04LTS

SWAP: 10GB

Root: 105GB

Home: 200GB