I upgraded our test server today from 5.2.3 to 5.5.1 using the upgrade package.  After opening the upgrade page "install/install.aspx?mode=upgrade", everything in the log completed with success.  After clicking the goto portal link I'm getting the below error.  Any ideas?

Thanks.

Server Error in '/' Application.

---

String was not recognized as a valid Boolean.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.FormatException: String was not recognized as a valid Boolean.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[FormatException: String was not recognized as a valid Boolean.] System.Boolean.Parse(String value) +10141492 DotNetNuke.Common.Initialize.CheckVersion(HttpApplication app) +95 DotNetNuke.Common.Initialize.InitializeApp(HttpApplication app) +863 DotNetNuke.Common.Initialize.Init(HttpApplication app) +172 DotNetNuke.HttpModules.RequestFilter.RequestFilterModule.FilterRequest(Object sender, EventArgs e) +579 System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +80 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +171

---

Version Information: Microsoft .NET Framework Version:2.0.50727.4952; ASP.NET Version:2.0.50727.4955