I had the same problem and initally created a refresh button
Protected Sub ButtonRefresh_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles ButtonRefresh.Click
FileManager1.DataBind()
FileManager1.Focus()
End Sub
This was not a solution but the user could at least press this and it would un-hang.
Additional research suggested that placing the control within a placeholder could help.
<
asp:PlaceHolder ID="PlaceHolder1" runat="server">
..... file manager here
</asp:PlacHolder>
I also have an ajax update pane on the page - but not surrounding the control.
<
asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
</ContentTemplate>
</asp:UpdatePanel>
This seem to have stopped the problem for me.
If anyone has a better solution I would like to hear it.
Regards Mark