I upgraded my installation from 7.3.4 to 7.4.1 and the upgrade was executed without a single issue (successful) but when I clicked view website I got this exception:

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: 

Stack Trace: 

[FormatException: String was not recognized as a valid Boolean.]
   System.Boolean.Parse(String value) +14292488
   System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider) +811
   DotNetNuke.Collections.CollectionExtensions.ConvertValue(Object value) +295
   DotNetNuke.Entities.Portals.PortalSettingsController.LoadPortalSettings(PortalSettings portalSettings) +867
   DotNetNuke.Entities.Portals.PortalSettings.BuildPortalSettings(Int32 tabId, PortalInfo portal) +52
   DotNetNuke.HttpModules.UrlRewrite.BasicUrlRewriter.RewriteUrl(Object sender, EventArgs e) +1954
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +92
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +165

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34248

Hi Sebastian:

I did try the link mentioned it did not work but thought of waiting for the latest script release for the 7.4.1 version and again it did not work. (NB ran the  TurboUnSchema for the previous release, AdjustDNNHostSettings, AdjustDNNPortalSettings and AdjustDNNTabSettings prior to the upgrade)

What is confusing, I have two portals (different domains)  on the same installation (and same DB), one is bilingual English/Arabic and the other is English only, the bilingual website generate the error while the English only website does not produce any errors and is up and running

The upgrade (from 7.3.4 to 7.4.1) was executed without generating a single error, and I check the upgrade logs in \Providers\DataProviders\SqlDataProvider and both files 07.04.01.log and 07.04.00.log were empty.