all anyone can say with this is that it’s a problem related to your max configuration. You could try trash the max preferences files, which will be recreated, or reinstalling max, that sort of thing…. do you not have another external object called "nodes" which could interfere ? I could open the patch without problem here (max 6.0.7 macosX 10.6.8). Did you restart max to begin with ? did it work well after restarting ?
Remember that if a patcher is in the search path, you can instantiate it as an abstraction. So this is likely to be the problem here, Max can’t know if you want to load the nodes object or the abstraction/patcher called nodes too.