Hi,
"c:\HostingSpaces\henna\renaissancehenna.com\wwwroot\Admin\ContentManager.aspx(36,68): error CS0103: The name 'useDialogForEditing' does not exist in the current context"
The problem is that variable does not exist in version 2.3.7.5, so you have some inconsistent deployment with some newer files, ie you have a newer version of the file ContentManager.aspx but the codebehind for that file is compiled into mojoPortal.Web.dll and you have the 2.3.7.5 version of that dll which does not have the variable "useDialogForEditing". You current deployment has some mishmash of newer and older version files.
My advice is to upgrade to the latest version of mojoPortal, deploying all the files in the latest package so that the files are all consistent. Be sure to backup your web.config file first so you can copy customizations such as the machinekey to the new Web.config file.
Hope that helps,
Joe