If you are getting this problem then it is most likely a problem with your computer's graphics card. Some graphics cards, usually the low end ones, do not support OpenGL very well so can cause EFD to crash when used in OpenGL mode. It is not just EFD that is affected, other programs that use OpenGL will also have problems.
How to fix this problem:
Check that you have the most up to date drivers for your graphics card.
Use DirectX mode - Go to SETTINGS > Display and change the graphics driver to DirectX. Using this mode will stop the crashing but will cause EFD to run more slowly.
If none of the above are to your satisfaction then we recommend you change your graphics card to something more robust, specifically designed for use with a CAD system.
Known graphics cards with problems:
Intel HD Graphics 4600 - as at 30th July 2015 - It has been noted that drivers released July 2015 do not resolve the problem.