gistfile1.txt

diff --git a/CefSharp.WinForms.Example/BrowserTabUserControl.Designer.cs b/CefSharp.WinForms.Example/BrowserTabUserControl.Designer.cs
index b97bf79f..1f454947 100644
--- a/CefSharp.WinForms.Example/BrowserTabUserControl.Designer.cs
+++ b/CefSharp.WinForms.Example/BrowserTabUserControl.Designer.cs
@@ -1,4 +1,6 @@
-<U+FEFF>namespace CefSharp.WinForms.Example
+<U+FEFF>using System.Windows.Forms;
+
+namespace CefSharp.WinForms.Example
 {
     partial class BrowserTabUserControl
     {
@@ -178,6 +180,13 @@
             this.ResumeLayout(false);
             this.PerformLayout();

+            this.urlTextBox.LostFocus += UrlTextBox_LostFocus;
+
+    }
+
+        private void UrlTextBox_LostFocus(object sender, System.EventArgs e)
+        {
+            MessageBox.Show("test");
         }

         #endregion

I am reproducing this with your gist. You need to lose focus and your new focus MUST BE the browser control. Steps are

1. Click on Url Text box to gain focus
2. Click on Browser Control
   Result: I see the MessageBox but the application is not responding and the cursor is stuck in loading state. The only thing I can do is to kill the process.

I am reproducing this on my home computer, both x64 and Win32 and on multiple computers are my work - it is reproducible on every computer I tried so far.