Microsoft .NET Framework error with Horizon 2.8.6.2

This is the error that straightaway poped up after installing the 2.8.62 version.
System.ArgumentException: File format is not valid.
at System.Windows.Forms.RichTextBox.StreamIn(Stream data, Int32 flags)
at System.Windows.Forms.RichTextBox.StreamIn(String str, Int32 flags)
at System.Windows.Forms.RichTextBox.set_Rtf(String value)
at (Object , String )
at A.VGI.E(Object E, String H)
at A.GHB.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Loaded Assemblies **************
mscorlib
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5485 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/Windows/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll

Horizon
Assembly Version: 2.8.6.2
Win32 Version: 2.8.6.2
CodeBase: file:///C:/Program%20Files%20(x86)/HorizonMB/Horizon.exe

System
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5485 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll

DevComponents.DotNetBar2
Assembly Version: 8.9.0.5
Win32 Version: 8.9.0.5
CodeBase: file:///C:/Program%20Files%20(x86)/HorizonMB/DevComponents.DotNetBar2.DLL

System.Windows.Forms
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5483 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll

System.Drawing
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5483 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll

Ionic.Zlib.CF
Assembly Version: 1.9.1.5
Win32 Version: 1.9.1.5
CodeBase: file:///C:/Program%20Files%20(x86)/HorizonMB/Ionic.Zlib.CF.DLL

ICSharpCode.SharpZipLib
Assembly Version: 0.86.0.518
Win32 Version: 0.86.0.518
CodeBase: file:///C:/Program%20Files%20(x86)/HorizonMB/ICSharpCode.SharpZipLib.DLL

System.Data.SQLite
Assembly Version: 1.0.65.0
Win32 Version: 1.0.65.0
CodeBase: file:///C:/Program%20Files%20(x86)/HorizonMB/System.Data.SQLite.DLL

System.Data
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5483 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/Windows/assembly/GAC_32/System.Data/2.0.0.0__b77a5c561934e089/System.Data.dll

System.Management
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5483 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Management/2.0.0.0__b03f5f7f11d50a3a/System.Management.dll

System.Configuration
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5483 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll

System.Core
Assembly Version: 3.5.0.0
Win32 Version: 3.5.30729.5420 built by: Win7SP1
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Core/3.5.0.0__b77a5c561934e089/System.Core.dll

System.Xml
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5485 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll

fv81rwso
Assembly Version: 0.0.0.0
Win32 Version: 2.0.50727.5485 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll

Accessibility
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5483 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/Accessibility/2.0.0.0__b03f5f7f11d50a3a/Accessibility.dll

z_it5wxm
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.5485 (Win7SP1GDR.050727-5400)
CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll

May be you guys could see if this could use the .net dlls than old outdated 2.0 and instead use the 4.0 dlls and also by the way there is a new net framework 4.6RC version available.

Now I just got another Unhandled exception from the start before the app is fully up; "File format is not valid.
************** Exception Text **************
System.ArgumentException: File format is not valid.
at System.Windows.Forms.RichTextBox.StreamIn(Stream data, Int32 flags)
at System.Windows.Forms.RichTextBox.StreamIn(String str, Int32 flags)
at System.Windows.Forms.RichTextBox.set_Rtf(String value)
at (Object , String )
at A.VGI.E(Object E, String H)
at A.GHB.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
This system has the .net framework of 3.5, 4.0, 4.5.2 x64

And this happens randomly?

yes with the newest version of Horizon, when I go back to the last version I had (2.8.6), I don’t get those errors with the .net framework.