I am trying to run Triple speed Ethernet ref design on Stratix II GX development.I followed all the steps given in reference design and able get it running as is. Now I want to make some changes to the design and test, but what ever I do I am not able to generate new SOF file. Code compiles with out any errors but its not generating SOF file and I am not able to understand how to test my changes.:confused: I tried using Quartus II - version 8.0 and 9.1 Any help or pointers is appreciated. Thanks in advance. I using evaluation license, that I got with Dev board kit.