If a long paragraph is copied into the editor, <br> tags appear in thea content without being added at first place. 

For the time being you can resolve this by adding the following script below the editor declaration:

<telerik:RadEditor runat="server" ID="RadEditor1" StripFormattingOptions="AllExceptNewLines"></telerik:RadEditor>

<script type="text/javascript">
    var oldStripFormatting = Telerik.Web.UI.Editor.Utils.stripFormatting;

    Telerik.Web.UI.Editor.Utils.stripFormatting = function (textHtml, clearValue) {
        if (clearValue === "ALL_NO_BRAKES") {
            textHtml = textHtml.replace(/\n/g, "");
            textHtml = textHtml.replace(/<\/p>/g, "<br/>");
        }

        textHtml = oldStripFormatting.call(this, textHtml, clearValue);
        return textHtml;
    }
</script>

Accepting tracked deleted block element will delete the following block element

A sample project for reproducing the issue is attached:

Each of the pages in the ContentUrl properties has an alert("PageName") displayed at pageLoad.

1, Brows the Default.aspx - an alert - page1 occurs

2. Select Level 2 tab, which would load the subTab - Page4 and the "page4" alert should be shown.

Problem : In addition to the "page4" alert - the "page5" alert is raised and the page5.aspx had been loaded along with page4.aspx.

----------------------------------

Workaround:
To workaround this issue, set the PageViewID property of the parent tab to be with the same value as the PageViewID property on the selected child tab.

<telerik:RadTabStrip runat="server" ID="RadTabStrip1" MultiPageID="rmpPages" Width="100%">
    <Tabs>
        <telerik:RadTab Text="Level 1" Selected="true" PageViewID="page1">
            <Tabs>
                <telerik:RadTab Text="Page 1" PageViewID="page1" Selected="true" />
                <telerik:RadTab Text="Page 2" PageViewID="page2" />
                <telerik:RadTab Text="Page 3" PageViewID="page3" />
            </Tabs>
        </telerik:RadTab>
        <telerik:RadTab Text="Level 2" PageViewID="page4">
            <Tabs>
                <telerik:RadTab Text="Page 4" PageViewID="page4" Selected="true" />
                <telerik:RadTab Text="Page 5" PageViewID="page5" />
                <telerik:RadTab Text="Page 6" PageViewID="page6" />
            </Tabs>
        </telerik:RadTab>
    </Tabs>
</telerik:RadTabStrip>

<telerik:RadMultiPage runat="server" ID="rmpPages">

    <telerik:RadPageView runat="server" ID="page1" ContentUrl="page1.aspx" Selected="true" />
    <telerik:RadPageView runat="server" ID="page2" ContentUrl="page2.aspx" />
    <telerik:RadPageView runat="server" ID="page3" ContentUrl="page3.aspx" />
    <telerik:RadPageView runat="server" ID="page4" ContentUrl="page4.aspx" />
    <telerik:RadPageView runat="server" ID="page5" ContentUrl="page5.aspx" />
    <telerik:RadPageView runat="server" ID="page6" ContentUrl="page6.aspx" />

</telerik:RadMultiPage>

The issue is reproducible with RadAlert, RadConfirm and RadPrompt dialogs without setting Behavior Move and DestroyOnClose="true"

Programmatic configuration of the data binding of markers is unavailable from the code behind.  

For example:
 RadMap1.DataBindings.MarkerBinding.DataShapeField = "Shape";
 RadMap1.DataBindings.MarkerBinding.DataTitleField = "City";
 RadMap1.DataBindings.MarkerBinding.DataLocationLatitudeField = "Latitude";
 RadMap1.DataBindings.MarkerBinding.DataLocationLongitudeField = "Longitude";

As a workaround use the overload method Dock(String zoneID):

RadDock1.Dock(RadDockZone1.ClientID);