After installing October 2015 Windows Updates on Windows 8.1 machine I found that all .NET applications (MSN Weather, HERE Maps, Lenovo Settings, VLC for Windows Store) starts slowly or crashes with allotted timeout error. I have also found numerous reports like that in Event Log:
App Microsoft.BingWeather_3.0.4.336_x64__8wekyb3d8bbwe prevented the load of generated binary \Device\HarddiskVolume3\Users\Petr\AppData\Local\Packages\Microsoft.BingWeather_8wekyb3d8bbwe\AC\Microsoft\CLR_v4.0\NativeImages\AppEx.Weath1591bf4e#\9a87d2f2d08bd8a78b9ff4981a26df8c\AppEx.WeatherApp.Services.ni.dll
due to error 0xC000047F. This could be because the binary is unsigned, contains an untrusted signature, or has been corrupted or tampered with.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-AppModel-Runtime" Guid="{F1EF270A-0D32-4352-BA52-DBAB41E1D859}" />
<EventID>11</EventID>
<Version>0</Version>
<Level>3</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x2000000000000001</Keywords>
<TimeCreated SystemTime="2015-10-13T20:46:11.274276000Z" />
<EventRecordID>5407</EventRecordID>
<Correlation />
<Execution ProcessID="5656" ThreadID="5684" />
<Channel>Microsoft-Windows-AppModel-Runtime/Admin</Channel>
</System>
<EventData>
<Data Name="PackageFullName">Microsoft.BingWeather_3.0.4.336_x64__8wekyb3d8bbwe</Data>
<Data Name="ErrorCode">3221226623</Data>
<Data Name="FailedBinary">\Device\HarddiskVolume3\Users\Petr\AppData\Local\Packages\Microsoft.BingWeather_8wekyb3d8bbwe\AC\Microsoft\CLR_v4.0\NativeImages\AppEx.Weath1591bf4e#\9a87d2f2d08bd8a78b9ff4981a26df8c\AppEx.WeatherApp.Services.ni.dll</Data>
</EventData>
</Event>
It looks like most of .NET native images are reported as corrupted now. Running SFC and CHKDSK havenot found any errors. The only way was to reinstall all affected applications. I studied the event log back and there were no such errors before.
Currently I can reproduce the issue on two different Windows 8.1 machines with different Microsoft accounts after October updates !
Petr