Xbox 360 MCE & unauthorized window error

[DreilingStL]

I have gotten next to nowhere on this issue and really need some help. Setup info below, but essentially I am unable to sustain a connection between my MCE and Media Center PC for more than a minute or two before being disconnected. Windows Event Viewer logs are also below. I can tell you that its NOT from security and/or fingerprint software, having removed both for diagnostic purposes. Based on my research and the event logs, it appears to be an issue with how the Xbox's remote session handles Windows 8 notifications (specifically, the popup or "toast" notifications). I can't say that this is the issue for sure, though, and I have no way of disabling notifications for the MCX account to confirm. PLEASE HELP!!!

Xbox 360 connected via either Ethernet or WiFi
Windows 8 Pro with Media Center Pack

Event Viewer Application Log for Media Center error details:
Log Name: Media Center
Source: Microsoft-Windows-Media Center Extender
Date: 3/20/2013 11:00:21 AM
Event ID: 123
Task Category: Session Enforcement
Level: Error
Keywords:
User: WILL-THINKPAD\Mcx2-WILL-THINKPAD
Computer: WILL-THINKPAD.DREILINGHOME.local
Description:
The Media Center Extender session was terminated because an unauthorized window opened in the session.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Media Center Extender" Guid="{7B7838A3-6562-4269-BB7A-97B0D9593882}" />
<EventID>123</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>1</Task>
<Opcode>0</Opcode>
<Keywords>0x8000000000000000</Keywords>
<TimeCreated SystemTime="2013-03-20T16:00:21.221108500Z" />
<EventRecordID>361</EventRecordID>
<Correlation />
<Execution ProcessID="3268" ThreadID="9872" />
<Channel>Media Center</Channel>
<Computer>WILL-THINKPAD.DREILINGHOME.local</Computer>
<Security UserID="S-1-5-21-4217462453-3185075838-817511817-1006" />
</System>
<EventData>
</EventData>
</Event>

[foxwood]

Create a new, ordinary user on the Windows 8 machine, and log in to the Windows machine with that new user account. Do you see any Popups from 3rd party applications that might also be popping up in the Extender user session, and causing the problem? If you do, try uninstalling the application that's generating the popups, or figure out how they are being triggered.

[DreilingStL]

Figured it out, thanks! Turns out Lenovo's on-screen hotkey notifications were the culprit (num lock, caps lock, etc.).