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Ok I'll try that now. In the mean time I deleted the pages that I was trying to add content to, and recreated them. When I went to add html content to one of them it errored out with the original error, and I get the following in the logs:
2009-05-12 14:04:11,066 ERROR mojoPortal.Web.mojoBasePage - 192.168.1.48-en-GB - /mojoportal/Admin/PageLayout.aspx?pageid=13 System.NullReferenceException: Object reference not set to an instance of an object at mojoPortal.Web.AdminUI.PageLayout.btnCreateNewContent_Click (System.Object sender, System.EventArgs e) [0x00000] at System.Web.UI.WebControls.Button.OnClick (System.EventArgs e) [0x00000] at System.Web.UI.WebControls.Button.RaisePostBackEvent (System.String eventArgument) [0x00000] at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent (System.String eventArgument) [0x00000] at System.Web.UI.Page.RaisePostBackEvent (IPostBackEventHandler sourceControl, System.String eventArgument) [0x00000] at System.Web.UI.Page.RaisePostBackEvents () [0x00000] at System.Web.UI.Page.ProcessRaiseEvents () [0x00000] at System.Web.UI.Page.InternalProcessRequest () [0x00000] at System.Web.UI.Page.ProcessRequest (System.Web.HttpContext context) [0x00000] 2009-05-12 14:04:11,119 ERROR mojoPortal.Web.Global - 192.168.1.48-en-GB - /mojoportal/Admin/PageLayout.aspx?pageid=13 System.NullReferenceException: Object reference not set to an instance of an object at mojoPortal.Web.AdminUI.PageLayout.btnCreateNewContent_Click (System.Object sender, System.EventArgs e) [0x00000] at System.Web.UI.WebControls.Button.OnClick (System.EventArgs e) [0x00000] at System.Web.UI.WebControls.Button.RaisePostBackEvent (System.String eventArgument) [0x00000] at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent (System.String eventArgument) [0x00000] at System.Web.UI.Page.RaisePostBackEvent (IPostBackEventHandler sourceControl, System.String eventArgument) [0x00000] at System.Web.UI.Page.RaisePostBackEvents () [0x00000] at System.Web.UI.Page.ProcessRaiseEvents () [0x00000] at System.Web.UI.Page.InternalProcessRequest () [0x00000] at System.Web.UI.Page.ProcessRequest (System.Web.HttpContext context) [0x00000] 2009-05-12 14:04:11,286 ERROR mojoPortal.Web.PageNotFoundHttpModule - PageNotFoundHttpModule handled error. System.Web.HttpException: Path '/mojoportal/Admin/Error.htm' was not found. at System.Web.StaticFileHandler.ProcessRequest (System.Web.HttpContext context) [0x00000] at System.Web.HttpApplication+<Pipeline>c__Iterator2.MoveNext () [0x00000] at System.Web.HttpApplication.Tick () [0x00000] 2009-05-12 14:04:11,871 ERROR mojoPortal.Web.Global - 192.168.1.48-en-GB - /mojoportal/Admin/Data/SiteImages/FeatureIcons/home.gif System.Web.HttpException: Path '/mojoportal/Admin/Data/SiteImages/FeatureIcons/home.gif' was not found. at System.Web.StaticFileHandler.ProcessRequest (System.Web.HttpContext context) [0x00000] at System.Web.HttpApplication+<Pipeline>c__Iterator2.MoveNext () [0x00000] at System.Web.HttpApplication.Tick () [0x00000] 2009-05-12 14:04:11,997 ERROR mojoPortal.Web.PageNotFoundHttpModule - PageNotFoundHttpModule handled error. System.Web.HttpException: Path '/mojoportal/Admin/Data/SiteImages/FeatureIcons/Error.htm' was not found. at System.Web.StaticFileHandler.ProcessRequest (System.Web.HttpContext context) [0x00000] at System.Web.HttpApplication+<Pipeline>c__Iterator2.MoveNext () [0x00000] at System.Web.HttpApplication.Tick () [0x00000]
Unfortunately that looks like a mono bug. Admittedly I've fallen behind in my testing and bug reporting of mono issues.