A change on the Minambiente site broke this map for MyTrails. Fortunately, a simple edit fixes it: MyTrails > Maps > tap on the IGM 25k (IT) line and in the map details editor, change the version from
1.3.0, then use the back button to save the change.
This will be available by default in the next beta release of MyTrails.
Update June 2019: the former IGM site disappeared entirely and I can’t find another source of high quality topo maps. I was able to find a server that offers black and white maps, but they’re broken down by region, so I can’t include them as-is in MyTrails.