Would you send the log to us?
1. Create a file called exmancoreliblog.yes and copy it to
Mac: /Users/<name>/Library/Application Support/Adobe/Extension Manager CC/Log/
Windows: C:\Users\<name>\AppData\Roaming\Adobe\Extension Manager CC\Log
2. Restart Extension Manager and reproduce your issue
3. Send us ExManCoreLibrary.log file in that log folder to email@example.com