I have been using Aptana for years now, and have become accustom to its many features.
It has been reliable up until I upgraded from Xubuntu 13.04 to 14.04.
Now
I have the same issues and exactly the same core dump error since upgraded to kubuntu 14.04. So far i have changed/installed the following:
-Install aplication as http://www.samclarke.com/2012/04/how-to-install-aptana-studio-3-on-ubuntu-12-04-lts-precise-pangolin/
-Changed gtk2 theme to qtcurve (after installing qtcurve)
-Added instruction ulimit -c unlimited to AptanaStudio3.sh just before main program
Since these changes i have been working for more than half an hour without problems but can't be sure if the problem has been fixed.
Hope this helps.