Yes, you had a good point no doubt, but I remembered that this issue was already discussed with no other solution than to delete .ftr file(s). But doing so, truck navigation functions are compromised.

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It's really hard to understand how can .ftr files affect voice commands and screen flickering as these files are just additional map attributes which has nothing to do with the graphic or with the voice commands. And on the other side Nextgen handles them without a problem.