diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index aeacd679d..26d87f578 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -3,6 +3,7 @@ D2X-Rebirth Changelog
 20100327
 --------
 main/kmatrix.c, main/net_udp.c: Initialise 'playing' to 0 for UDP kmatrix, making sure player progresses to next level; always return 1 when starting to join a UDP game so it doesn't immediately return to the main menu
+main/gameseq.c, main/menu.c: Hide mission dialog before the level intro screens are shown, make sure it doesn't try to show it again after it was closed - fixing bad memory access
 
 20100326
 --------
diff --git a/main/gameseq.c b/main/gameseq.c
index e4d1345f3..cf65d36e1 100644
--- a/main/gameseq.c
+++ b/main/gameseq.c
@@ -1832,6 +1832,8 @@ void maybe_set_first_secret_visit(int level_num)
 //	secret_flag if came from a secret level
 void StartNewLevel(int level_num, int secret_flag)
 {
+	hide_menus();
+	
 	GameTime = FrameTime;
 	ThisLevelTime=0;
 
diff --git a/main/menu.c b/main/menu.c
index e1091cefd..128f1910c 100644
--- a/main/menu.c
+++ b/main/menu.c
@@ -116,7 +116,7 @@ enum MENUS
 
 #define ADD_ITEM(t,value,key)  do { m[num_options].type=NM_TYPE_MENU; m[num_options].text=t; menu_choice[num_options]=value;num_options++; } while (0)
 
-static window *menus[16];
+static window *menus[16] = { NULL };
 
 // Function Prototypes added after LINTING
 void do_option(int select);
@@ -133,6 +133,9 @@ void hide_menus(void)
 	window *wind;
 	int i;
 	
+	if (menus[i])
+		return;		// there are already hidden menus
+
 	for (i = 0; (i < 15) && (wind = window_get_front()); i++)
 	{
 		menus[i] = wind;
@@ -150,7 +153,10 @@ void show_menus(void)
 	int i;
 	
 	for (i = 0; (i < 16) && menus[i]; i++)
-		window_set_visible(menus[i], 1);
+		if (window_exists(menus[i]))
+			window_set_visible(menus[i], 1);
+
+	menus[0] = NULL;
 }
 
 //pairs of chars describing ranges