I have this little problem:
I put a rich texteditor in my module system tabs,but when load page it give me one javascript error on this component ,and i can't write in it.
I use the same code to register this control in edit page of module and it works fine.

<%@ Control Language="vb" AutoEventWireup="false" CodeFile="Settings.ascx.vb" Inherits="DotNetNuke.Modules.MyModuleName.Settings" Explicit ="true" %>
<%@ Register TagPrefix="dnn" TagName="Label" Src="~/controls/LabelControl.ascx" %>
<%@ Register TagPrefix="dnn" TagName="ttd" Src="~/controls/TextEditor.ascx" %>



in .vb I have this

Partial Class Settings
Inherits Entities.Modules.ModuleSettingsBase

I'm having the same problem.

Thought it might have been because Setting pages needs to inherit the ModuleSettingsBase class and not the PortalModuleBase class, but ModuleSettingsBase inherits PortalModuleBase anyway, so that shouldn't be an issue.

Have you had any luck?