I don't see what the issues is other than if you are running on windows 10.
Windows 10 has a log of gfx issues due to a direct x out of date issue.
https://www.tinyurl.com/j3fnoju
1. Not implemented
2.You can join/create channels.
3.About 90% certain this is implemented.
4.Probably won't be implemented as it would use more bandwidth.