I have done some more testing on two different HDI 7 units, one upgraded to the latest version, one with older software, (but they behaved exactly the same way in my test).
I created a map with two different colourpalettes from the common colour scheme:
Palette 1: 9,56,62,16,218,15,21,20,14,19,12,4
Palette 2: 1,44,56,62,11,16,17,22,21,23,19,12
I processed the maps with atlas 7 and with Atlas 10. (I'd rather not use Atlas 12 since it won't work on Elite (non HDI) units then?) I also encrypted one version and left one unencrypted. Alltogether 8 different versions of the same map. All of them works fine on the Elite 5 and HDS 7 units I tried them on.
Only one version works on the Elite 7 HDI (the encrypted Atlas 10 version with palette 1). All other versions fail to display and causes the units to reboot.
The Elite 7 HDI units also displays an encrypted map from Atlas 7 with colours 15,16,9,12.
I will try them on a CHIRP tomorrow and see what happens.