diff --git a/portlibs/include/pnglibconf.h b/portlibs/include/pnglibconf.h
index b4428fb6..e9e9deaf 100644
--- a/portlibs/include/pnglibconf.h
+++ b/portlibs/include/pnglibconf.h
@@ -204,6 +204,6 @@
 #define PNG_Z_DEFAULT_NOFILTER_STRATEGY 0
 #define PNG_Z_DEFAULT_STRATEGY 1
 #define PNG_sCAL_PRECISION 5
-#define PNG_sRGB_PROFILE_CHECKS 2
+#define PNG_sRGB_PROFILE_CHECKS 0
 /* end of settings */
 #endif /* PNGLCONF_H */
diff --git a/portlibs/lib/libpng.a b/portlibs/lib/libpng.a
index f925c6f0..ec608b03 100644
Binary files a/portlibs/lib/libpng.a and b/portlibs/lib/libpng.a differ
diff --git a/source/memory/mem2alloc.cpp b/source/memory/mem2alloc.cpp
index dedeec3d..d9c82003 100644
--- a/source/memory/mem2alloc.cpp
+++ b/source/memory/mem2alloc.cpp
@@ -5,7 +5,7 @@
 #include <algorithm>
 #include <string.h>
 #include "lockMutex.hpp"
-
+#include "gecko/gecko.hpp"
 void CMEM2Alloc::init(void *addr, void *end)
 {
 	m_baseAddress = (SBlock *)(((u32)addr + 31) & ~31);
@@ -38,6 +38,14 @@ unsigned int CMEM2Alloc::usableSize(void *p)
 	return p == 0 ? 0 : ((SBlock *)p - 1)->s * sizeof (SBlock);
 }
 
+bool CMEM2Alloc::is_valid(const SBlock *block)
+{
+	if((u32)block >= (u32)m_baseAddress && (u32)block < (u32)m_endAddress)
+		return true;
+	gprintf("WARNING: Found invalid memory location!\n");
+	return false;
+}
+
 void *CMEM2Alloc::allocate(unsigned int s)
 {
 	if (s == 0)
@@ -92,7 +100,7 @@ void *CMEM2Alloc::allocate(unsigned int s)
 		j->next = i->next;
 		j->prev = i;
 		i->next = j;
-		if((((u32)j->next) & 0xf0000000) != 0)
+		if(j->next != 0 && is_valid(j->next))
 			j->next->prev = j;
 	}
 	return (void *)(i + 1);
@@ -109,24 +117,26 @@ void CMEM2Alloc::release(void *p)
 
 	// If there are no other blocks following yet,
 	// set the remaining size to free size. - Dimok
-	if((((u32)i->next) & 0xf0000000) == 0)
+	if(i->next == 0)
 		i->s = m_endAddress - i - 1;
 
 	// Merge with previous block
-	if ((((u32)i->prev) & 0xf0000000) != 0 && i->prev->f)
+	if (i->prev != 0 && is_valid(i->prev) && is_valid(i->prev->next) && i->prev->f)
 	{
 		i = i->prev;
 		i->s += i->next->s + 1;
-		i->next = i->next->next;
-		if((((u32)i->next) & 0xf0000000) != 0)
+		if(i->next->next != 0 && is_valid(i->next->next))
+		{
+			i->next = i->next->next;
 			i->next->prev = i;
+		}
 	}
 	// Merge with next block
-	if ((((u32)i->next) & 0xf0000000) != 0 && i->next->f)
+	if (i->next != 0 && is_valid(i->next) && i->next->f)
 	{
 		i->s += i->next->s + 1;
 		i->next = i->next->next;
-		if((((u32)i->next) & 0xf0000000) != 0)
+		if(i->next != 0 && is_valid(i->next))
 			i->next->prev = i;
 	}
 }
@@ -154,18 +164,18 @@ void *CMEM2Alloc::reallocate(void *p, unsigned int s)
 	}
 
 	// Last block
-	if (((((u32)i->next) & 0xf0000000) == 0) && i + s + 1 < m_endAddress)
+	if (i->next == 0 && i + s + 1 < m_endAddress)
 	{
 		i->s = s;
 		return p;
 	}
 	// Size <= current size + next block
-	if ((((u32)i->next) & 0xf0000000) != 0 && i->s < s && i->next->f && i->s + i->next->s + 1 >= s)
+	if (i->next != 0 && is_valid(i->next) && i->s < s && i->next->f && i->s + i->next->s + 1 >= s)
 	{
 		// Merge
 		i->s += i->next->s + 1;
 		i->next = i->next->next;
-		if((((u32)i->next) & 0xf0000000) != 0)
+		if(i->next != 0 && is_valid(i->next))
 			i->next->prev = i;
 	}
 	// Size <= current size
@@ -181,7 +191,7 @@ void *CMEM2Alloc::reallocate(void *p, unsigned int s)
 			j->next = i->next;
 			j->prev = i;
 			i->next = j;
-			if((((u32)j->next) & 0xf0000000) != 0)
+			if(j->next != 0 && is_valid(j->next))
 				j->next->prev = j;
 		}
 		return p;
@@ -208,13 +218,11 @@ unsigned int CMEM2Alloc::FreeSize()
 
 	for(i = m_first; i != 0; i = i->next)
 	{
-		if(i->f && (((u32)i->next) & 0xf0000000) != 0)
+		if(i->f && i->next != 0 && is_valid(i->next))
 			size += i->s;
-
-		else if(i->f && (((u32)i->next) & 0xf0000000) == 0)
+		else if(i->f && i->next == 0)
 			size += m_endAddress - i - 1;
-
-		else if(!i->f && (((u32)i->next) & 0xf0000000) == 0)
+		else if(!i->f && i->next == 0)
 			size += m_endAddress - i - i->s - 1;
 	}
 
diff --git a/source/memory/mem2alloc.hpp b/source/memory/mem2alloc.hpp
index 69a99cc2..209fd7af 100644
--- a/source/memory/mem2alloc.hpp
+++ b/source/memory/mem2alloc.hpp
@@ -31,6 +31,7 @@ private:
 		SBlock *prev;
 		bool f;
 	} __attribute__((aligned(32)));
+	bool is_valid(const SBlock *block);
 	SBlock *m_baseAddress;
 	SBlock *m_endAddress;
 	SBlock *m_first;