diff --git a/Core/FileSystems/ISOFileSystem.cpp b/Core/FileSystems/ISOFileSystem.cpp
index 7d57efb8fb..b7be83d8f3 100644
--- a/Core/FileSystems/ISOFileSystem.cpp
+++ b/Core/FileSystems/ISOFileSystem.cpp
@@ -273,7 +273,7 @@ u32 ISOFileSystem::OpenFile(std::string filename, FileAccess access)
 	{
 		u32 sectorStart = 0xFFFFFFFF, readSize = 0xFFFFFFFF;
 		parseLBN(filename, &sectorStart, &readSize);
-		INFO_LOG(FILESYS, "Got a raw sector read %s, sector %08x, size %08x", filename.c_str(), sectorStart, readSize);
+		INFO_LOG(FILESYS, "Got a raw sector open: %s, sector %08x, size %08x", filename.c_str(), sectorStart, readSize);
 		u32 newHandle = hAlloc->GetNewHandle();
 		entry.seekPos = 0;
 		entry.file = 0;
diff --git a/Core/HLE/sceIo.cpp b/Core/HLE/sceIo.cpp
index 2beb1ede04..46d1e21197 100644
--- a/Core/HLE/sceIo.cpp
+++ b/Core/HLE/sceIo.cpp
@@ -256,11 +256,11 @@ void sceIoGetstat()
 {
 	const char *filename = Memory::GetCharPointer(PARAM(0));
 	u32 addr = PARAM(1);
-	DEBUG_LOG(HLE,"sceIoGetstat(%s, %08x)",filename,addr);
 
 	SceIoStat *stat = (SceIoStat*)Memory::GetPointer(addr);
 	PSPFileInfo info = pspFileSystem.GetFileInfo(filename);
 	__IoGetStat(stat, info);
+	DEBUG_LOG(HLE,"sceIoGetstat(%s, %08x) : sector = %08x",filename,addr,info.startSector);
 
 	RETURN(0);
 }
diff --git a/Core/HLE/sceKernelThread.cpp b/Core/HLE/sceKernelThread.cpp
index 168e51b139..879996780c 100644
--- a/Core/HLE/sceKernelThread.cpp
+++ b/Core/HLE/sceKernelThread.cpp
@@ -825,8 +825,11 @@ u32 sceKernelStartThread()
 
 		//now copy argument to stack
 		for (int i = 0; i < (int)argSize; i++)
-			Memory::Write_U8(Memory::Read_U8(argBlockPtr + i), sp + i);
+			Memory::Write_U8(argBlockPtr ? Memory::Read_U8(argBlockPtr + i) : 0, sp + i);
 
+		if (!argBlockPtr && argSize > 0) {
+			WARN_LOG(HLE,"sceKernelStartThread : had NULL arg");
+		}
 		return 0;
 	}
 	else
diff --git a/Core/HLE/sceUmd.cpp b/Core/HLE/sceUmd.cpp
index 06b802279f..635a226da2 100644
--- a/Core/HLE/sceUmd.cpp
+++ b/Core/HLE/sceUmd.cpp
@@ -83,10 +83,9 @@ void sceUmdActivate()
 {
 	u32 unknown = PARAM(0);
 	const char *name = Memory::GetCharPointer(PARAM(1));
-	u32 retVal	= 1;
+	u32 retVal	= 0;
 	__KernelUmdActivate();
 	DEBUG_LOG(HLE,"%i=sceUmdActivate(%08x, %s)", retVal, unknown, name);
-	//__KernelUMDActivate();
 	RETURN(retVal);
 }
 
diff --git a/Core/HLE/sceUtility.cpp b/Core/HLE/sceUtility.cpp
index 31dc0580a5..956e1e4e8f 100644
--- a/Core/HLE/sceUtility.cpp
+++ b/Core/HLE/sceUtility.cpp
@@ -379,9 +379,15 @@ void sceUtilityGetSystemParamInt()
 	RETURN(0);
 }
 
+u32 sceUtilityLoadNetModule(u32 module)
+{
+	DEBUG_LOG(HLE,"FAKE: sceUtilityLoadNetModule(%i)", module);
+	return 0;
+}
+
 const HLEFunction sceUtility[] = 
 {
-	{0x1579a159, 0, "sceUtilityLoadNetModule"},
+	{0x1579a159, &WrapU_U<sceUtilityLoadNetModule>, "sceUtilityLoadNetModule"},
 	{0xf88155f6, 0, "sceUtilityNetconfShutdownStart"}, 
 	{0x4db1e739, 0, "sceUtilityNetconfInitStart"}, 
 	{0x91e70e35, 0, "sceUtilityNetconfUpdate"},	 
diff --git a/Core/MIPS/MIPS.cpp b/Core/MIPS/MIPS.cpp
index 48ec684729..67171894d1 100644
--- a/Core/MIPS/MIPS.cpp
+++ b/Core/MIPS/MIPS.cpp
@@ -126,7 +126,7 @@ void MIPSState::RunLoopUntil(u64 globalTicks)
 #ifdef _DEBUG
 			while (CoreTiming::downcount >= 0 && coreState == CORE_RUNNING)
 #else
-			while (CoreTiming::downcount >= 0)
+			while (CoreTiming::downcount >= 0 && mipsr4k.pc)
 #endif
 			{
 				// int cycles = 0;
diff --git a/Core/MIPS/MIPSInt.cpp b/Core/MIPS/MIPSInt.cpp
index f666f7e776..fb3df6beb9 100644
--- a/Core/MIPS/MIPSInt.cpp
+++ b/Core/MIPS/MIPSInt.cpp
@@ -302,22 +302,30 @@ namespace MIPSInt
 	}
 
 
+
 	void Int_RType3(u32 op)
 	{
 		int rt = _RT;
 		int rs = _RS;
 		int rd = _RD;
+		static bool has_warned = false;
 
 		switch (op & 63) 
 		{
 		case 10: if (R(rt) == 0) R(rd) = R(rs); break; //movz
 		case 11: if (R(rt) != 0) R(rd) = R(rs); break; //movn
 		case 32: 
-			ERROR_LOG(HLE,"WARNING : exception-causing add at %08x", PC);
+			if (!has_warned) {
+				ERROR_LOG(HLE,"WARNING : exception-causing add at %08x", PC);
+				has_warned = true;
+			}
 			R(rd) = R(rs) + R(rt);		break; //add
 		case 33: R(rd) = R(rs) + R(rt);		break; //addu
 		case 34: 
-			ERROR_LOG(HLE,"WARNING : exception-causing sub at %08x", PC);
+			if (!has_warned) {
+				ERROR_LOG(HLE,"WARNING : exception-causing sub at %08x", PC);
+				has_warned = true;
+			}
 			R(rd) = R(rs) - R(rt);		break; //sub
 		case 35: R(rd) = R(rs) - R(rt);		break; //subu
 		case 36: R(rd) = R(rs) & R(rt);		break; //and