What are the different versions of MHEG?
At present (May-06), most Freeview boxes can handle MHEG-5 V1.05 (often abbreviated to just MHEG 1.05) and broadcasters adhere to that standard. However, it would appear that very shortly broadcasters will be free to convert to the MHEG-5 V1.06 standard (often abbreviated to just MHEG 1.06), which very few Freeview boxes are certified as being able to cope with. Newer boxes may be upgraded to the new standard by means of on-air downloads. Older boxes are unlikely to be upgraded. I do not know what new facilities if any are offered by the new version, nor do I know what functions if any will fail to work on a non-upgraded box should transmissions convert to the new version. As far as I know there is no simple way to determine which MHEG version a Freeview box complies with; the software version displayed by boxes is not the same thing.