Yosemite Application Memory

I have DraftSight installed on Yosemite and it works perfectly... except after two hours of use my mac is running at 80gb of swapped memory and then pauses due to 'run out of application memory'.

Ive contacted apple and they assure me its an issue with third party software i.e. DraftSight.

 

Anyone know any fixes/when draft sight is realising an update?

 

Thanks

David