MLBTV - fine on iPad, iPhone - ATV2 - no bueno

Question

I don't get it.
Comcast business line in my home. 50MB down 15MB up. Guaranteed.  I am an engineer so I move very large files globally overnight. No throttling here.
MLB is my relief from CAD - unless I have to use my Apple TV2.
Streaming MLB games is pitiful 75% of the time on my ATV2.  It's directly connected to my Comcast router via a Cat5e cable at 100MB.  Same router feeds my wireless access point.
I can view and enjoy games on my iPad and my iPhone (you know - because I spent incremental money getting the applications for each of them) - but the same game on my ATV2 is unwatchable.
I don't mean I'm not thrilled I can't see the type of tobacco the players have in their mouths - I mean the pixel issues, pausing, dropped audio/video, hard reboots in the midst of a game, buffering issues etc are all very obvious and distracting on my ATV2.
What's going on?
I happen to have a Roku (which I got before the ATV2 was released specifically for MLB.TV) and I cannot replicate the issues the ATV is having.
I see that I'm not alone - but, in the new world of Apple tech people actually reading these forums now - can anyone shed any light?

Answer 1

hi,
Whilst the iMessages account has seemed to prefer iCloud type Apple ID  it does not use the iCloud servers.
As the app logs in the ID and password is checked against what is "registered" with the iMessages server.
What is known is that there are two (at least) issues where the Mac version does not Login properly but the iOS devices can.
One is obvious as it gives this Error Message.
The second is very close to this but it appears to Log in then every contact returns a "Not Registered with iMessages" error message.
This has been further complicated by Text Forwarding Linking and the use of SMS when the Account then tries to send it via SMS.
You most likely will have to contact Apple Support.
You will need to explain that you think you have an Account issue with the iMessages server for your Mac.
Unfortunately the Level 1 people you get through to initially are very Script led and try to fit you into either Software or hardware issues which need Apple Care or payment.
If this happens Ask to speak to a Level 2 person and ask them to check.
The bit that is different about the Mac is that it uses the Serial Number to create a validation key that allows the login.
The iOS devices don't do this.
Hope this helps
10:12 pm      Friday; December 26, 2014
​  iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad