I had been using Draftsight quite happily on my old iMac but when I migrated to a new iMac Retina 5K machine running OS X Yosemite version 10.10.4 it would not load. I have deleted the brought over copy and downloaded afresh but every time I try to launch the application it gets so far and then an error message appears with notice that Draftsight quit unexpectedly and with - ignore/retry options.

Any help on this would be appreciated. Many thanks.  Gareth