I accidentally replied to the Post instead of  pushing the reply to your comment. Please see my Reply.

I have includes so I can have the same include in all my skin ascx pages, then I only have to edit the one include if I have to make a change.
I am not familiar with Webforms. I want to be able to edit the includes in any code editor or text editor.
I am new to aspx and ascx pages. Should I be doing something different?

If you are using DNN 9.1.1 can you run a test for me?

1. Add this code <%=PortalSettings.ActiveTab.TabName%> into your C# skin ascx page. Clear the DNN cache and browser cache then reload the page and go into DNN admin edit mode.

2. Add 3 or 4 modules into different content panes on the page (not the same content pane) and let me know what happens. What happens to me is, when I try to two or more modules it will move all the modules on the page into the last or current content pane that I am adding the module to.

Use the Inspect Element feature of your browser and you will see that the div class="DNNAjaxPanel" has disappeared. If you Inspect Element of a Skin ascx page that doesn't have the code and you will see the div class="DNNAjaxPanel" is there.

Note: the div class="DNNAjaxPanel" is the div just above the div class="DNNEmptyPane dnnSortable dnnModuleManager ui-sortable"

Please test. I think there is a bug in DNN 9.9.1.

Thanks,
Craig