Hi Mindy,

I can confirm that customized versions of PAT files you attached hangs AutoCAD for Mac when you start HATCH command. Actually it doesn't really hang, but loads hatch definitions from PAT file, but this lasts forever in AutoCAD for Mac, while in PC version of AutoCAD custom hatch patterns loads instantly.
Custom hatches in the PAT files you provided are really very complex.
I think we can consider this as a bug in AutoCAD for Mac - it loads complex hatch patterns very slowly, so there is no workaround at this time. Unless you will find similar patterns, but not so complex in its definitions.

Maxim