I havent used HM much lately, and I know they changed the HUD preferences around some, when they added the export/import layout feature. When this thread was busy was when there was no options for layouts. I am not sure how the new feature affects it when you import those old prefs files.
The old method, before the addition of layouts, would have been to delete prefs.xml, pospref.txt, and pospref2.txt, with HM closed. When you relaunch HM it would rebuild those to original. Then you close HM, and paste in the new HUD config files you downloaded. Unfortunately, I dont know if it works in the same manner.