From ea9653fa83c26bbca87a49899dd9486ab73b1d93 Mon Sep 17 00:00:00 2001
From: Shannon Deminick <sdeminick@gmail.com>
Date: Sun, 12 May 2013 21:12:55 -1000
Subject: [PATCH] patches fix for #U4-2214

---
 src/umbraco.businesslogic/BasePages/BasePage.cs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/umbraco.businesslogic/BasePages/BasePage.cs b/src/umbraco.businesslogic/BasePages/BasePage.cs
index 25c0d5e0ec..25a09f9b25 100644
--- a/src/umbraco.businesslogic/BasePages/BasePage.cs
+++ b/src/umbraco.businesslogic/BasePages/BasePage.cs
@@ -261,9 +261,17 @@ namespace umbraco.BasePages
                             return encTicket.DecryptWithMachineKey();
                         }
                     }
-                    catch (HttpException ex)
+                    catch (Exception ex)
                     {
                         // we swallow this type of exception as it happens if a legacy (pre 4.8.1) cookie is set
+                        if (ex is ArgumentException || ex is FormatException || ex is HttpException)
+                        {
+                            StateHelper.Cookies.UserContext.Clear();
+                        }
+                        else
+                        {
+                            throw;
+                        }
                     }
                 }
                 return "";