diff --git a/code/renderergl1/tr_init.c b/code/renderergl1/tr_init.c
index b2ccea2a..be95195a 100644
--- a/code/renderergl1/tr_init.c
+++ b/code/renderergl1/tr_init.c
@@ -1291,6 +1291,10 @@ void RE_Shutdown( qboolean destroyWindow ) {
 		GLimp_Shutdown();
 
 		Com_Memset( &glConfig, 0, sizeof( glConfig ) );
+		textureFilterAnisotropic = qfalse;
+		maxAnisotropy = 0;
+		displayAspect = 0.0f;
+
 		Com_Memset( &glState, 0, sizeof( glState ) );
 	}
 
diff --git a/code/renderergl2/tr_init.c b/code/renderergl2/tr_init.c
index 4d19cc88..b12d338d 100644
--- a/code/renderergl2/tr_init.c
+++ b/code/renderergl2/tr_init.c
@@ -1528,6 +1528,11 @@ void RE_Shutdown( qboolean destroyWindow ) {
 		GLimp_Shutdown();
 
 		Com_Memset( &glConfig, 0, sizeof( glConfig ) );
+		Com_Memset( &glRefConfig, 0, sizeof( glRefConfig ) );
+		textureFilterAnisotropic = qfalse;
+		maxAnisotropy = 0;
+		displayAspect = 0.0f;
+
 		Com_Memset( &glState, 0, sizeof( glState ) );
 	}
 
diff --git a/code/sdl/sdl_glimp.c b/code/sdl/sdl_glimp.c
index debf80e9..a27eb3ed 100644
--- a/code/sdl/sdl_glimp.c
+++ b/code/sdl/sdl_glimp.c
@@ -308,6 +308,13 @@ static void GLimp_ClearProcAddresses( void ) {
 	QGL_ES_1_1_PROCS;
 	QGL_3_0_PROCS;
 
+	qglActiveTextureARB = NULL;
+	qglClientActiveTextureARB = NULL;
+	qglMultiTexCoord2fARB = NULL;
+
+	qglLockArraysEXT = NULL;
+	qglUnlockArraysEXT = NULL;
+
 #undef GLE
 }