Spartan does not work at all build 10049

Upgraded my Oracle VB Windows 10 TP to build 10049, First time failed and it was reverted to 10041. 2nd time worked after I uninstalled Classic Shell and got rid of Windows.old from 10041 upgrade. Took 4+ hours which is totally unacceptable.

Anyway, every time I try to start Spartan I get the following error in Event Viewer:

Log Name: Application
Source: Microsoft-Windows-Immersive-Shell
Date: 4/2/2015 10:44:31 AM
Event ID: 5973
Task Category: (5973)
Level: Error
Keywords:
User: WIN-BQ9IMGT1KF5\rrkurtz
Computer: WIN-BQ9IMGT1KF5
Description:
Activation of app Microsoft.Windows.Spartan_cw5n1h2txyewy!Microsoft.Spartan.Spartan failed with error: The app didn't start in the required time. See the Microsoft-Windows-TWinUI/Operational log for additional information.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Immersive-Shell" Guid="{315A8872-923E-4EA2-9889-33CD4754BF64}" />
<EventID>5973</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>5973</Task>
<Opcode>0</Opcode>
<Keywords>0x2000000000000000</Keywords>
<TimeCreated SystemTime="2015-04-02T14:44:31.463650100Z" />
<EventRecordID>4386</EventRecordID>
<Correlation />
<Execution ProcessID="3796" ThreadID="3404" />
<Channel>Application</Channel>
<Computer>WIN-BQ9IMGT1KF5</Computer>
<Security UserID="S-1-5-21-1845931109-4021624400-2641665333-1000" />
</System>
<EventData>
<Data Name="AppId">Microsoft.Windows.Spartan_cw5n1h2txyewy!Microsoft.Spartan.Spartan</Data>
<Data Name="ErrorCode">-2144927142</Data>
</EventData>
</Event>

Microsoft-Windows-TWinUI/Operational has this:

Log Name: Microsoft-Windows-TWinUI/Operational
Source: Microsoft-Windows-Immersive-Shell
Date: 4/2/2015 10:42:15 AM
Event ID: 5959
Task Category: (5959)
Level: Error
Keywords:
User: WIN-BQ9IMGT1KF5\rrkurtz
Computer: WIN-BQ9IMGT1KF5
Description:
Activation of the app Microsoft.Windows.Spartan_cw5n1h2txyewy!Microsoft.Spartan.Spartan for the Windows.Launch contract timed out.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Immersive-Shell" Guid="{315A8872-923E-4EA2-9889-33CD4754BF64}" />
<EventID>5959</EventID>
<Version>0</Version>
<Level>2</Level>
<Task>5959</Task>
<Opcode>0</Opcode>
<Keywords>0x4000000000000000</Keywords>
<TimeCreated SystemTime="2015-04-02T14:42:15.330771300Z" />
<EventRecordID>520</EventRecordID>
<Correlation />
<Execution ProcessID="3796" ThreadID="3252" />
<Channel>Microsoft-Windows-TWinUI/Operational</Channel>
<Computer>WIN-BQ9IMGT1KF5</Computer>
<Security UserID="S-1-5-21-1845931109-4021624400-2641665333-1000" />
</System>
<EventData>
<Data Name="AppId">Microsoft.Windows.Spartan_cw5n1h2txyewy!Microsoft.Spartan.Spartan</Data>
<Data Name="ContractId">Windows.Launch</Data>
</EventData>
</Event>

I'm going to create the iso and try a clean install and see what happens.

Created the iso for 10049 using WHS's ESD Converter tool then did a Clean Install. Spartan now works. Initial impression not good.

1. You need to type the URL for the page you want as a home page, no "Use current" selection.
2. No "Home" button or icon.
3. Setting is very sparse (thus the name Spartan I guess).
4. Favorites bar entries chopped off at bottom (hidden behind top of web page being displayed).
5. Management of Favorites is clunky and non-intuitive.

On the plus side, I was able to login here and post this with no problem.