I have the same problem, my os is winxp sp3( italian version) and use portable version 0.89 of Smath Studio

the details of error are:

See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
at System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
at System.ThrowHelper.ThrowArgumentOutOfRangeException()
at System.Collections.Generic.List`1.get_Item(Int32 index)
at SMath.Control.CanvasControl.ParseInsertString(String value)
at SMath.Control.CanvasControl.Insert(String value)
at SMath.Desktop.canv.ActionEscaper(String value)
at SMath.Desktop.canv.canvasControl1_PreviewKeyDown(Object sender, PreviewKeyDownEventArgs e)
at System.Windows.Forms.Control.OnPreviewKeyDown(PreviewKeyDownEventArgs e)
at System.Windows.Forms.Control.PreProcessControlMessageInternal(Control target, Message& msg)
at System.Windows.Forms.Application.ThreadContext.PreTranslateMessage(MSG& msg)


************** Loaded Assemblies **************
mscorlib
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400)
CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll

---

SMathStudio_Desktop
Assembly Version: 0.89.3856.7126
Win32 Version: 1.1.15.0
CodeBase: file:///C:/Programmi/smathstudio/SMathStudio_Desktop.exe

---

System.Windows.Forms
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll

---

System
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll

---

System.Drawing
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll

---

ioman
Assembly Version: 0.89.3856.7122
Win32 Version: 0.89.3856.7122
CodeBase: file:///C:/Programmi/smathstudio/ioman.DLL

---

Accessibility
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/Accessibility/2.0.0.0__b03f5f7f11d50a3a/Accessibility.dll

---

HTMLFileType
Assembly Version: 1.2.3856.6720
Win32 Version: 1.2.3856.6720
CodeBase: file:///C:/Programmi/smathstudio/plugins/HTMLFileType.dll

---

canvas
Assembly Version: 0.89.3856.7124
Win32 Version: 0.89.3856.7124
CodeBase: file:///C:/Programmi/smathstudio/canvas.DLL

---

SpecialFunctions
Assembly Version: 1.2.3856.6823
Win32 Version: 1.2.3856.6823
CodeBase: file:///C:/Programmi/smathstudio/plugins/SpecialFunctions.dll

---

XMCDFileType
Assembly Version: 1.2.3856.6795
Win32 Version: 1.2.3856.6795
CodeBase: file:///C:/Programmi/smathstudio/plugins/XMCDFileType.dll

---

System.Configuration
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll

---

System.Xml
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.1433 (REDBITS.050727-1400)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll

---

NuLib
Assembly Version: 1.55.3856.7123
Win32 Version: 1.55.3856.7123
CodeBase: file:///C:/Programmi/smathstudio/NuLib.DLL

---

SyLib
Assembly Version: 1.22.3856.7123
Win32 Version: 1.22.3856.7123
CodeBase: file:///C:/Programmi/smathstudio/SyLib.DLL

---

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
<system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.


Regards
Stefano

Hello Andrey,

I tried on few more computers today (install and portable SMath) and again the error. There is no need for any file. Just try to run SMath and first thing you do after that is to press F8, nothing else. Or open, say, an example file and press F8. It will be Ok if you click in any region before that. But if you clik eanywhere on an empty space in the worksheet and press F8 "Unhandled exception..." will ocur.
I hope that you could reproduce this or someone else except me and stefanodel

Regards,
Radovan

Thanks, reproduced. Will fix.

Regards.