Well, this is an odd one. I was planning to switch to Max 6 full time yet and I've just noticed a weird bug:
When I open Max 6 and look under the 'Arrange' menu, 'Route Patch Cords' is there with the SHIFT+CMD+Y shortcut next to it.
I open a new patch and 'Route Patch Cords' remains, but the shortcut isn't labelled anymore, and doesn't work!
Using 6.0.8 on 10.6.8