I didn't see anything suspicious in your logs I saw this black screen when antivirus is checking stream (simple solution - exclude MP processes from checking) or it is case of some incompatibility between MP2 and GPU - in my case it was built-in GPU (Intel HD 3000), but it affected all videos not only online streams.Logs can be helpfull, but did you exclude MP from antivirus checking?
Yea I have antivirus and firewall opened up for MP2. Client.log is attached.