I've just updated the Fidder4 and got the error on start:

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Awww, Fiddlesticks!
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Fiddler has encountered an unexpected problem. If you believe this is a bug in Fiddler, please copy this message by hitting CTRL+C, and submit a bug report at http://www.telerik.com/forums/fiddler.

The composition produced a single composition error. The root cause is provided below. Review the CompositionException.Errors property for more detailed information.



1) Unknown error (0x278)



Resulting in: An exception occurred while trying to create an instance of type 'Telerik.NetworkConnections.NetworkConnectionsManager'.



Resulting in: Cannot activate part 'Telerik.NetworkConnections.NetworkConnectionsManager'.

Element: Telerik.NetworkConnections.NetworkConnectionsManager -->  Telerik.NetworkConnections.NetworkConnectionsManager -->  DirectoryCatalog (Path="E:\Program Files\Fiddler\Fiddler")



Resulting in: Cannot get export 'Telerik.NetworkConnections.NetworkConnectionsManager (ContractName="Telerik.NetworkConnections.NetworkConnectionsManager")' from part 'Telerik.NetworkConnections.NetworkConnectionsManager'.

Element: Telerik.NetworkConnections.NetworkConnectionsManager (ContractName="Telerik.NetworkConnections.NetworkConnectionsManager") -->  Telerik.NetworkConnections.NetworkConnectionsManager -->  DirectoryCatalog (Path="E:\Program Files\Fiddler\Fiddler")



Type: System.ComponentModel.Composition.CompositionException
Source: System.ComponentModel.Composition
   at System.ComponentModel.Composition.Hosting.CompositionServices.GetExportedValueFromComposedPart(ImportEngine engine, ComposablePart part, ExportDefinition definition)

   at System.ComponentModel.Composition.Hosting.CatalogExportProvider.GetExportedValue(ComposablePart part, ExportDefinition export, Boolean isSharedPart)

   at System.ComponentModel.Composition.Hosting.CatalogExportProvider.CatalogExport.GetExportedValueCore()

   at System.ComponentModel.Composition.Primitives.Export.get_Value()

   at System.ComponentModel.Composition.ExportServices.GetExportedValueFromLazy[T](Export export)

   at System.ComponentModel.Composition.Hosting.ExportProvider.GetExportedValueCore[T](String contractName, ImportCardinality cardinality)

   at Fiddler.Proxy..ctor(Boolean isPrimary, ProxySettings upstreamProxySettings) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Common\Core\Proxy.cs:line 208

   at Fiddler.frmViewer.‹•(String[] ˆ•) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Viewer.cs:line 2906

   at Fiddler.frmViewer.‡•(String[] ˆ•) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Viewer.cs:line 2723


Fiddler v5.0.20192.25091 (x86 x86) [.NET 4.0.30319.1 on Microsoft Windows NT 5.1.2600 Service Pack 3]
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OK   
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As the result - can't start Fiddler any more.
Heeelp

Fiddler Crashes on Startup always... help...

Problem signature:
  Problem Event Name:    APPCRASH
  Application Name:    Fiddler.exe
  Application Version:    5.0.20194.41348
  Application Timestamp:    5d95d558
  Fault Module Name:    KERNELBASE.dll
  Fault Module Version:    6.1.7601.23915
  Fault Module Timestamp:    59b94f2a
  Exception Code:    e0434352
  Exception Offset:    000000000001a06d
  OS Version:    6.1.7601.2.1.0.256.1
  Locale ID:    1046
  Additional Information 1:    61cb
  Additional Information 2:    61cb26cba9a9974f11aa5666ed1a9345
  Additional Information 3:    a03c
  Additional Information 4:    a03cf54e7635b40933f9c088e4cafa40

 

class handlers

{

    static var oTimer: System.Windows.Forms.Timer = new Timer();
    public static ToolsAction("Request by Timer")
    function doIt()
    {
        oTimer = new Timer();
        oTimer.add_Tick(OnTimer);
        oTimer.Interval = 5000;
        oTimer.Start();
    }

    public static ToolsAction("Stop Timer")
    function stopIt()
    { 
        oTimer.Stop();
    }

        
    public static function OnTimer(sender: Object, ea: EventArgs)
    {
        var s = "GET blah blah";
        try{ 
            FiddlerObject.utilIssueRequest(s); 
        } 
        catch(e){ 
            MessageBox.Show("send failed" + e.ToString()); 
        }
    }

    static function OnBeforeResponse(oSession: Session) {

        if (oSession.utilFindInResponse("request start", false)>-1)
        {
            doIt();
        }

        if (oSession.utilFindInResponse("request stop", false)>-1)
        {
            stopIt();
        }

}

}

 

"Tool" -> "Request by timer" and "Stop Timer" works fine.

stopit(); wokrs fine too in if statement.

But doIt(); doesn't work in if statement.

I'm not good at computer thing and English too.

I can't figure out what's wrong. 

Please help and thank you in advance.

When the fiddler is running, everything is fine, but the data is wrong.
When the fiddler is off, then collect the http (s) data by chrome in the "network" section, the data is correct.
I need to know the cause.
Can someone help me ???

I would like to download FiddlerCore to get up to speed nohow I can use it in my applications. When I go to the downloads page as stated on the downloads page I cannot find the link forFiddlerCore. I have Attached my screen shot for assistance.

 

Thanks

Alex.

 

Just wondering what's the logic behind it, as most programs use %ProgramFiles%.

If you have an ideology against central folders, why not supporting a portable version?

When launching Fiddler "Automatic" Breakpoints are always set to "Disabled".

How can they be enabled to either "Before Responses" or "After Responses by default?

As the question, please help me how to backup settings & restore it in another computer. Thanks.

After starting the program, a subfolder Fiddler2 is created in the Documents folder. Is it possible to adjust its location, move to a higher level in the home folder, for example?