Attached is the output after a crash.  I was attempting to create a route in Nambia.  THe airfields have been created as Custom Data. This information is from version  V2 Beta but 1.4.4 also does the same.

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

************** Exception Text **************
System.ArgumentException: Invalid identifier specified:
Parameter name: identifier
   at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)
   at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args)
   at Divelements.Aviation.FlightPlanner.Routing.x623a54d0e478ee0f.Invoke(SkyDemonAction method)
   at Divelements.Aviation.Routing.PenetrationCalculation.CalculateAsync()
   at Divelements.Aviation.FlightPlanner.Routing.x623a54d0e478ee0f.xc1bd39b0591195f7(Object x92c17a18c13dd85c)

************** Loaded Assemblies **************
mscorlib
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4952 (win7RTMGDR.050727-4900)
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v2.0.50727/mscorlib.dll
----------------------------------------
SkyDemon
    Assembly Version: 1.4.5.32593
    Win32 Version:
    CodeBase: file:///C:/Program%20Files%20(x86)/Divelements%20Limited/SkyDemon/SkyDemon.exe
----------------------------------------
Divelements.Aviation
    Assembly Version: 1.0.4034.32591
    Win32 Version: 1.0.4034.32591
    CodeBase: file:///C:/Program%20Files%20(x86)/Divelements%20Limited/SkyDemon/Divelements.Aviation.DLL
----------------------------------------
System.Windows.Forms
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900)
    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: 2.0.50727.4927 (NetFXspW7.050727-4900)
    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: 2.0.50727.4927 (NetFXspW7.050727-4900)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
Divelements.SandGrid
    Assembly Version: 2.2.4.1
    Win32 Version: 2.2.4.1
    CodeBase: file:///C:/Program%20Files%20(x86)/Divelements%20Limited/SkyDemon/Divelements.SandGrid.DLL
----------------------------------------
SandDock
    Assembly Version: 3.0.6.1
    Win32 Version: 3.0.6.1
    CodeBase: file:///C:/Program%20Files%20(x86)/Divelements%20Limited/SkyDemon/SandDock.DLL
----------------------------------------
Divelements.Mapping
    Assembly Version: 1.0.4034.32591
    Win32 Version: 1.0.4034.32591
    CodeBase: file:///C:/Program%20Files%20(x86)/Divelements%20Limited/SkyDemon/Divelements.Mapping.DLL
----------------------------------------
System.Xml
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
SandBar
    Assembly Version: 1.4.3.1
    Win32 Version: 1.4.3.1
    CodeBase: file:///C:/Program%20Files%20(x86)/Divelements%20Limited/SkyDemon/SandBar.DLL
----------------------------------------
System.Configuration
    Assembly Version: 2.0.0.0
    Win32 Version: 2.0.50727.4927 (NetFXspW7.050727-4900)
    CodeBase: file:///C:/Windows/assembly/GAC_MSIL/System.Configuration/2.0.0.0__b03f5f7f11d50a3a/System.Configuration.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.

That makes it look rather like your custom data is causing the problem. Check the identifiers you have used. In particular, if you have defined a flight information region, it MUST have an identifier and that identifier must be a standard ICAO four-letter format.

Thanks

That did the trick. I delete the FIR definitions. I created this data a while ago before I found out FIR's are not needed.