diff --git a/pcsx2/DebugTools/DisR3000A.cpp b/pcsx2/DebugTools/DisR3000A.cpp
index 5898eafabe..1e56556588 100644
--- a/pcsx2/DebugTools/DisR3000A.cpp
+++ b/pcsx2/DebugTools/DisR3000A.cpp
@@ -28,7 +28,8 @@ namespace R3000A
 		"r0", "at", "v0", "v1", "a0", "a1","a2", "a3",
 		"t0", "t1", "t2", "t3", "t4", "t5","t6", "t7",
 		"s0", "s1", "s2", "s3", "s4", "s5","s6", "s7",
-		"t8", "t9", "k0", "k1", "gp", "sp","fp", "ra"};
+		"t8", "t9", "k0", "k1", "gp", "sp","fp", "ra"
+		"HI", "LO" };
 
 	const char * const disRNameCP0[] = {
 		"Index"     , "Random"    , "EntryLo0", "EntryLo1", "Context" , "PageMask"  , "Wired"     , "*Check me*",
diff --git a/pcsx2/IopSio2.cpp b/pcsx2/IopSio2.cpp
index 5019d57a6a..cd842ab81f 100644
--- a/pcsx2/IopSio2.cpp
+++ b/pcsx2/IopSio2.cpp
@@ -156,7 +156,7 @@ void sio2_serialIn(u8 value){
 	if (sio2.cmdlength) sio2.cmdlength--;
 	sioWrite8(value);
 
-	if (sio2.packet.sendSize > BUFSIZE) {//asadr
+	if (sio2.packet.sendSize >= BUFSIZE) {//asadr
 		Console.Warning("*PCSX2*: sendSize >= %d", BUFSIZE);
 	} else {
 		sio2.buf[sio2.packet.sendSize] = sioRead8();
@@ -183,7 +183,7 @@ void sio2_fifoIn(u8 value){
 	if (sio2.cmdlength) sio2.cmdlength--;
 	SIODMAWrite(value);
 
-	if (sio2.packet.sendSize > BUFSIZE) {//asadr
+	if (sio2.packet.sendSize >= BUFSIZE) {//asadr
 		Console.WriteLn("*PCSX2*: sendSize >= %d", BUFSIZE);
 	} else {
 		sio2.buf[sio2.packet.sendSize] = sioRead8();
diff --git a/pcsx2/Plugins.h b/pcsx2/Plugins.h
index 368d48a8ca..bd4c8c5ce4 100644
--- a/pcsx2/Plugins.h
+++ b/pcsx2/Plugins.h
@@ -298,7 +298,8 @@ protected:
 	volatile u32				m_mcdOpen;
 
 public:		// hack until we unsuck plugins...
-	ScopedPtr<PluginStatus_t>	m_info[PluginId_Count];
+	// +1 to avoid out-of-bounds due to PluginId_Mcd which is above PluginId_Count
+	ScopedPtr<PluginStatus_t>	m_info[PluginId_Count + 1];
 
 public:
 	SysCorePlugins();
diff --git a/pcsx2/VUops.cpp b/pcsx2/VUops.cpp
index d96cdb7557..e25ca41b56 100644
--- a/pcsx2/VUops.cpp
+++ b/pcsx2/VUops.cpp
@@ -176,19 +176,21 @@ static __ri void __fastcall _vuFMACAdd(VURegs * VU, int reg, int xyzw) {
 		if (VU->fmac[i].enable == 1) continue;
 		break;
 	}
-	//if (i==8) Console.Error("*PCSX2*: error , out of fmacs %d", VU->cycle);
 
+	if (i < 8) {
+		VUM_LOG("adding FMAC pipe[%d]; xyzw=%x", i, xyzw);
 
-	VUM_LOG("adding FMAC pipe[%d]; xyzw=%x", i, xyzw);
-
-	VU->fmac[i].enable = 1;
-	VU->fmac[i].sCycle = VU->cycle;
-	VU->fmac[i].Cycle = 3;
-	VU->fmac[i].reg = reg;
-	VU->fmac[i].xyzw = xyzw;
-	VU->fmac[i].macflag = VU->macflag;
-	VU->fmac[i].statusflag = VU->statusflag;
-	VU->fmac[i].clipflag = VU->clipflag;
+		VU->fmac[i].enable = 1;
+		VU->fmac[i].sCycle = VU->cycle;
+		VU->fmac[i].Cycle = 3;
+		VU->fmac[i].reg = reg;
+		VU->fmac[i].xyzw = xyzw;
+		VU->fmac[i].macflag = VU->macflag;
+		VU->fmac[i].statusflag = VU->statusflag;
+		VU->fmac[i].clipflag = VU->clipflag;
+	} else {
+		//Console.Error("*PCSX2*: error , out of fmacs %d", VU->cycle);
+	}
 }
 
 static __ri void __fastcall _vuFDIVAdd(VURegs * VU, int cycles) {