RichardHeart, as we discussed with Qyron below, the APK has been modified to print golang's standard library net package error message directly to the user.
If you get a moment, could you run the new APK and tell us what the net package is saying?
We expect something like "write to UDP6 ... network unreachable", but if would be informative if the error is something different.
Richard, we reverted this change after Qyron ran his test. Basically Melondream is failing to send an IPv6 UDP packet with an 8-byte payload. Maybe this is an Android 7.0 problem, or a problem with the interaction between golang's net package and Android. Sorry
If you get a moment, could you run the new APK and tell us what the net package is saying?
We expect something like "write to UDP6 ... network unreachable", but if would be informative if the error is something different.