I made a fresh install of SAGE 6.6 and with a first test I run in the following problem:
1.1+1.0
Unhandled SIGILL: An illegal instruction occurred in Sage. This probably occurred because a compiled component of Sage has a bug in it and is not properly wrapped with sig_on(), sig_off(). Sage will now terminate.
Whereas
1.0+1.0
2.00000000000000
works.
I Use a macbook Pro 13" (2009) with OS 10.9.5 and sage-6.6-x86_64-Darwin-OSX_10.7_x86_64-app
Any Ideas what is going wrong?