Still seeing same issue with a Windows 64-bit packaged build using MyoPlugin 0.7.12, latest MyoConnect (0.15.0) and latest Myo firmware (1.4.1670). Built UE4 executable crashes on startup. The stack trace is identical to the above quoted post. Myo Connect is running and PIE (Play in Editor) works fine.
I followed the steps on Shipping/Packaged Builds. One thing that is unclear is whether to copy the Binaries folder from the root of the plugin distribution files or from <UE4 Project>\Plugins\MyoPlugin\Binaries after doing a build. I assume it is the former rather than the latter. In other words, I assume the point of step is to get the dependencies myo32.dll and myo64.dll into <deployment folder>\WindowsNoEditor<project name>\Binaries\WinXX\ where XX is 32 or 64, respectively.
@Cupit: what did you do to get your packaged build working?