Hi there

I've got a plugin that uses config/Dashboard.config to load a back office .NET user control on a new Content tab. The user control contains an anchor as follows:

<script type="text/javascript">
    function openPopup() {
        //CORRECT: This opens /umbraco/plugins/package/page.aspx in a popup window
        window.open('/umbraco/plugins/package/popup.aspx', '_blank');

        //INCORRECT: This opens /umbraco/#/ in a popup window
        window.open('/app_plugins/package/popup.aspx', '_blank');
    }
</script>

<asp:LinkButton runat="server" ID="btn" Text="text" OnClientClick="openPopup(); return false;" />

Based on the above, if window.open points to an aspx page in /App_Plugins/, then it opens the Umbraco backoffice in the popup. However if window.open points to an aspx page in /Umbraco/plugins/, then it opens the correct aspx page as anticipated in the popup.

This used to work in Umbraco 7.0.0 - 7.2.1, but in 7.2.2 this suddenly broke. Furthermore, there are no client side errors when clicking the link button and opening up the wrong page and nothing logged in the trace logs. I am using a clean install of Umbraco.

When it's opening up a new instance of the backoffice in the popup, I can see the initial URL in the popup is /umbraco/#/login which then immediately afterwards changes to /umbraco/#/

Is is possible that in 7.2.2 some backoffice behaviour changed that might be causing this in terms of the root App_Plugins folder?

Any help would be appreciated.

Rigardt