dloeliger,
Unfortunately, I am having a very similar issue to yours. My wiremap function (tried 3 different Android devices, and all of them the same error) fails on pins 1 and 8 when I try it on any cables 10m and above. I've fully updated all my devices (both their firmware, and PE app version), and even tried downgrading the PE firmware to a version before FW 26; still the same thing. I'm currently at FW 29 on my PE, and can't find any resolution.
Hopefully a forum admin will see this thread, and be able to shed some light on what's going on. Maybe the PE doesn't like being upgraded on Windows 10, I don't have a clue.
If you have any updates, make sure you post them here. Snowman out.