Thanks for the prompt responses.

Unfortunately mapupdater isn't much better doesn't fare much better and I base this statement on the fact that the 2014.40 update was done through this software and was the start of the DEM map issue. But, from what I now know, the file itself was never touched, but just renamed. Anyone know why?

As for renaming it, does this not have any effect on any other software on the device? and when this is done, the DEM maps are visible in settings/my maps on the device, and I will be able to turn the DEM on and off as before? If however, there are any issues, will reverting it's name resolve any issues. I like to just be prepared. I like to anticipate what could be around the coner's corner's corner, nothing like being as prepared as possible.

Also, the DEM map does appear to all be working finne, just no user input option on the device to turn it off or on. Is this the case?or am I missing something.

How the hell did Garmin miss this?

On a positive note, the 3d buildings especially in London are pretty impressive.