So much for Freeview approved hardware etc working in "harmony" with the Freeview Transmission!

From: http://www.dishtv.co.nz/News/

Changes to the Freeview broadcastTuesday, 30 April 2013 17:05 Freeview  has recently made some changes to the broadcast which has   affected Record Bookings in Freeview approved DTRs. The result can be   that recordings are not happening although they have been booked by the   user. This is because the information about those bookings is actually   sent via the Freeview broadcast and when it changes the DTR is no  longer  able to record the program you booked. It is possible that these changes will also affect the channels loaded into non-recording Freeview receivers.
To correct this problem please Factory default your unit via the  menu  and rescan your channels.

• For  users of the DishTV T1020, T1050,  S7090 and S7070r this can be done in   the main menu by selecting Installation  -> Factory Reset. Select Yes  and enter the pin number (the default is  0000). This   will allow you to rescan all channels by following the onscreen menu.   After rescanning the channels you will need to reselect your Record   Bookings as the factory reset will have deleted all of these.
• For MagicTV users please go to Menu -> Settings -> System -> Factory Reset. After  the factory reset please follow the onscreen instructions to rescan the  channels. After rescanning the channels you will need to reselect your  Record Bookings as the factory reset will have deleted all of these.

Unfortunately   Freeview intends to make more changes to the broadcast over the next   two weeks. This  can continue to affect your Record Bookings and will   sometimes cause them to stop working. While these changes are happening   to the broadcast the only solution is a factory reset as above.

DishTV does not have any control over these changes as they are made by Freeview.