Mac issues with slow cursor , un-usable version 2015

Hi, i had for years, Draftsight installed over my mac machines. Never had the actual issue  I have with 2015 version.

the cursor is extremely Slow and the crosshair is pursuiving the cursor across the screen. That makes unusable at all the program. Dassault says that problem may be solved at iquestions but not found any solution at all.

does anyone know the solution for this 2015 release of Draftsight ( MAC version) .(same at ubuntu linux)??

Dassault : Please, let us use the last usable version (2014) of the program in the meanwhile, or our work, bussines, and activities, will be a disaster not having the habitual tool we use for our work. (I know we have beta flavour in our hands...) but also is only that , that we have...

the ultimate question : 

when definitive (not beta) mac release ???

many thanks for all . Any solution maybe apreciated.

francisco dans . Spain (desolated user)