sorry, I can´t reproduce your report. I´m sitting at LOWW and when I try a “direct to” in the G1000 I can select the AML (in Greece), no freeze. When I hit activate - no freeze.
Using: AIRAC 2013 revision 4 & Navigraph Navdata beta client 19
About the duplicates:
When you look for AML in the worldmap you see also both NDBs (Greeze and Marocco). When you go to GMAD as an example, which is near AML in Marocco you will see that you can only select this NDB from the list - you will not get the AML in Greece. I don´t know the rules behind the G1000 in the sim about the ranges but it looks like, that they are looking for the navaids in a specific range only. That´s not what we have in our hand.
I have tested the same in the TBM930 and here you see the different/duplicated AMLs:
It could also possible, that this is a G1000 limitation, I don´t know. But the main point is:
I can´t reproduce your freezing in the G1000. Please check your latest client and the latest revision. Possible, remove and install the AIRAC again via the latest client beta 19.