UPDATE: Im talking to myself here, but incase anyone ever has the same problem

the module im updating uses javascript

it registers it like so in PAGE LOAD

            If Not Me.Page.IsClientScriptBlockRegistered("PA_JEDI") Then
                Me.Page.RegisterClientScriptBlock("PA_JEDI", "<script src=""" & Page.ResolveUrl("DesktopModules/PA_JobBoard/treeview.js") & """></script>")
            End If

This function was obsolete, so i updated it with

            If Not Me.Page.ClientScript.IsClientScriptBlockRegistered("PA_JEDI") Then  e.Page.ClientScript.IsClientScriptBlockRegistered("PA_JEDI")
                Me.Page.ClientScript.RegisterClientScriptBlock(Me.GetType(), "PA_JEDI", "<script src=""" & ("DesktopModules/PA_JobBoard/treeview.js") & """></script>")


            End If

And this is what was causing the problem. Somehow this method isnt correct, I havent investigated further. But that causes some error i guess that doesnt get reported, and disables further navigation