Interesting result here.  I deployed your example on a separate site on the problem server, and it worked perfectly.  I then added your code to my existing project and it no longer works (gets the same js error listed in original post).  Perhaps it's a web.config issue?  Here's my web.config

<configuration>

  <configSections>

    <section name="infragistics.web" type="System.Configuration.SingleTagSectionHandler,System, Version=1.0.3300.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />

    <sectionGroup name="applicationSettings" type="System.Configuration.ApplicationSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">

      <section name="SAInsight_II.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />

    </sectionGroup>

  </configSections>

  <infragistics.web styleSetName="Default" styleSetPath="~/ig_res" />

  <connectionStrings>

    <add name="ApplicationServices" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient" />

  </connectionStrings>

  <system.web>

    <compilation debug="true" targetFramework="4.0">

      <assemblies>

        <add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />

        <add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />

        <add assembly="System.DirectoryServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A" />

        <add assembly="Infragistics4.Web.v12.1, Version=12.1.20121.1005, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" />

        <add assembly="Infragistics4.WebUI.Documents.Reports.v12.1, Version=12.1.20121.1005, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" />

        <add assembly="Infragistics4.WebUI.Documents.Excel.v12.1, Version=12.1.20121.1005, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" />

        <add assembly="Infragistics4.WebUI.Shared.v12.1, Version=12.1.20121.1005, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" />

        <add assembly="Infragistics4.WebUI.WebDataInput.v12.1, Version=12.1.20121.1005, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" />

        <add assembly="Infragistics4.WebUI.WebHtmlEditor.v12.1, Version=12.1.20121.1005, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" />

        <add assembly="Infragistics4.WebUI.Documents.Core.v12.1, Version=12.1.20121.1005, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" />

      </assemblies>

    </compilation>

    <authentication mode="Windows" />

    <membership>

      <providers>

        <clear />

        <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/" />

      </providers>

    </membership>

    <profile>

      <providers>

        <clear />

        <add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/" />

      </providers>

    </profile>

    <roleManager enabled="false">

      <providers>

        <clear />

        <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/" />

        <add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/" />

      </providers>

    </roleManager>

    <customErrors defaultRedirect="Error.aspx" mode="RemoteOnly">

      <!--<error statusCode="404" redirect="filenotfound.htm" />-->

    </customErrors>

    <sessionState timeout="240">

    </sessionState>

    <httpRuntime requestValidationMode="2.0" />

  </system.web>

  <system.webServer>

    <modules runAllManagedModulesForAllRequests="true" />

  </system.webServer>

  <applicationSettings>

    <SAInsight_II.Properties.Settings>

      <setting name="Environment" serializeAs="String">

        <value>Production</value>

      </setting>

    </SAInsight_II.Properties.Settings>

  </applicationSettings>

</configuration>

Also, the other thing that might be very relevant is your project was probably created from scratch with 12.1, whereas mine was a conversion from 11.1.  Perhaps something is missing in the conversion process?

We also put your code on our server, and we had the same problem with your code that we are having with ours.

Well I believe I figured out the problem....

If you have it set to debug="true" in web.config file everything works like a charm...

Obviously we don't want that, so what can we do to correct this?  Your file does not work when debug is to false for me but does when set to true...  same goes for my own application...

Thank you. This issue was fixed in version 12.1.20121.2020

Hi Trung,

The latest service release is 12.1.20121.2020. You can download it from our website. The fix should be included in this build.

Feel free to contact us if you have any further questions.

Hello,

Please let me know when we have the latest Service Release for 12.1 with this issue resolved ?

Version that I am using 12.1.20121.1005 and this issue occurs exactly.

Thank you,

Trung

Hello,

The issue should be resolved with the latest Service Release for 11.1, 11.2 and 12.1.

Thank you for choosing Infragistics.

Hello,

The issue is logged with our Development team and has ID - 112817.