First of I would like to state that Civ4 runs stabily on my AMD64 3700+ w/integrated Nvidia 6100 under Windows x64 edition. The problem I am having is that a Civ declared war on me, however when iI go to attack him my guys just pass right through him as if I have open borders with him. When he attacks he gets me. This problem applies to all his units. Is there something I am doing wrong or is this a genuine bug? Thank you for your help.