diff --git a/AssemblyVersion.cs b/AssemblyVersion.cs
index e6ee2e3..8a85ff9 100644
--- a/AssemblyVersion.cs
+++ b/AssemblyVersion.cs
@@ -16,5 +16,5 @@ using System.Reflection;
 //
 // You can specify all the values or you can default the Revision and Build Numbers 
 // by using the '*' as shown below:
-[assembly: AssemblyVersion("3.0.4.576")]
-[assembly: AssemblyFileVersion("3.0.4.576")]
\ No newline at end of file
+[assembly: AssemblyVersion("3.0.4.577")]
+[assembly: AssemblyFileVersion("3.0.4.577")]
\ No newline at end of file
diff --git a/Core/Pages.cs b/Core/Pages.cs
index 600ad2f..6d2d981 100644
--- a/Core/Pages.cs
+++ b/Core/Pages.cs
@@ -1561,7 +1561,7 @@ namespace ScrewTurn.Wiki {
 				name.Contains("?") || name.Contains("<") || name.Contains(">") || name.Contains("|") || name.Contains(":") ||
 				name.Contains("*") || name.Contains("\"") || name.Contains("/") || name.Contains("\\") || name.Contains("&") ||
 				name.Contains("%") || name.Contains("'") || name.Contains("\"") || name.Contains("+") || name.Contains(".") ||
-				name.Contains("#") || name.Contains("[") || name.Contains("]")) {
+				name.Contains("#") || name.Contains("[") || name.Contains("]") || name.Contains("__")) {
 				return false;
 			}
 			else return true;