diff --git a/RomPatcher.js b/RomPatcher.js
index 7df5143..003bd33 100644
--- a/RomPatcher.js
+++ b/RomPatcher.js
@@ -1,8 +1,9 @@
-/* RomPatcher.js v20180920 - Marc Robledo 2016-2018 - http://www.marcrobledo.com/license */
+/* RomPatcher.js v20180924 - Marc Robledo 2016-2018 - http://www.marcrobledo.com/license */
 var MAX_ROM_SIZE=33554432;
-var MORE_SNES_SIZES_HEADERLESS=[786432,1310720,1572864,2621440,3145728,5242880,6291456];
+var MORE_SNES_SIZES_HEADERLESS=[393216,786432,1310720,1572864,2621440,3145728,5242880,6291456]; //note: 393216 is a PCE file size
 
 
+var DEBUG_CREATE_UNHEADERED_PATCH=false;
 
 var romFile, headeredRomFile, unheaderedRomFile, patch, romFile1, romFile2, tempFile;
 /* Shortcuts */
@@ -96,7 +97,7 @@ addEvent(window,'load',function(){
 });
 
 function isPowerOfTwo(romFile){return romFile.fileSize && (romFile.fileSize & (romFile.fileSize-1))===0}
-function isSNESExtension(romFile){return /\.(smc|sfc|fig|swc)$/.test(romFile.fileName)}
+function isSNESExtension(romFile){return /\.(smc|sfc|fig|swc|pce)$/.test(romFile.fileName)}
 function isSNESHeaderless(romFile){return isSNESExtension(romFile) && (isPowerOfTwo(romFile) || MORE_SNES_SIZES_HEADERLESS.indexOf(romFile.fileSize)>=0)}
 function isSNESHeadered(romFile){return isSNESExtension(romFile) && (isPowerOfTwo(romFile.fileSize-512) || MORE_SNES_SIZES_HEADERLESS.indexOf(romFile.fileSize-512)>=0)}
 
@@ -149,6 +150,13 @@ function applyPatchFile(p,r){
 			unheaderedPatchedROM.fileName=patchedROM.fileName;
 			unheaderedPatchedROM.writeBytes(0, patchedROM.readBytes(512, patchedROM.fileSize-512));
 			unheaderedPatchedROM.save();
+
+			if(DEBUG_CREATE_UNHEADERED_PATCH){
+				romFile1=unheaderedRomFile;
+				romFile2=unheaderedPatchedROM;
+				unheaderedPatchedROM.fileName=unheaderedPatchedROM.fileName.replace(' (patched)','');
+				createPatchFile();
+			}
 		}else{
 			patchedROM.save();
 		}
diff --git a/_cache_service_worker.js b/_cache_service_worker.js
index a495928..ee1317a 100644
--- a/_cache_service_worker.js
+++ b/_cache_service_worker.js
@@ -12,7 +12,7 @@ limitations under the License.
 mod by marcrobledo, original from: https://github.com/GoogleChrome/samples/blob/gh-pages/service-worker/basic/service-worker.js
 */
 
-const PRECACHE_ID='v20180920';
+const PRECACHE_ID='v20180926';
 const PRECACHE_FILES=[
 'index.html','./',
 'RomPatcher.css',
diff --git a/bps.js b/bps.js
index 16ba825..e8d7c32 100644
--- a/bps.js
+++ b/bps.js
@@ -1,4 +1,4 @@
-/* BPS module for RomPatcher.js v20180428 - Marc Robledo 2016-2018 - http://www.marcrobledo.com/license */
+/* BPS module for RomPatcher.js v20180926 - Marc Robledo 2016-2018 - http://www.marcrobledo.com/license */
 /* File format specification: https://www.romhacking.net/documents/746/ */
 
 var BPS_MAGIC='BPS1';
@@ -49,9 +49,12 @@ BPS.prototype.apply=function(romFile){
 			seek+=action.length;
 		}else if(action.type===BPS_ACTION_SOURCE_COPY || action.type===BPS_ACTION_TARGET_COPY){
 			seek+=decodeBPS(this.file, seek).length;
+		}else{
+			//console.log(action.type)
 		}
 	}
 	tempFile=new MarcBinFile(newFileSize);
+	//alert(newFileSize);
 
 
 	//patch
@@ -68,6 +71,7 @@ BPS.prototype.apply=function(romFile){
 		if(action.type===BPS_ACTION_SOURCE_READ){
 			tempFile.writeBytes(outputOffset, romFile.readBytes(outputOffset, action.length));
 			outputOffset+=action.length;
+			//seek+=action.length;
 
 		}else if(action.type===BPS_ACTION_TARGET_READ){
 			tempFile.writeBytes(outputOffset, this.file.readBytes(seek, action.length));
@@ -118,8 +122,10 @@ function readBPSFile(file){
 
 	var decodedMetaDataLength=decodeBPS(file, seek);
 	seek+=decodedMetaDataLength.length;
-	patchFile.metaData=file.readString(seek, decodedMetaDataLength.length);
-	seek+=patchFile.metaData.length;
+	if(decodedMetaDataLength.number){
+		patchFile.metaData=file.readString(seek, decodedMetaDataLength.number);
+		seek+=patchFile.metaData.number;
+	}
 
 	patchFile.actionsOffset=seek;
 	patchFile.file=file;
diff --git a/index.html b/index.html
index 51535c9..837d8ea 100644
--- a/index.html
+++ b/index.html
@@ -103,7 +103,7 @@
 
 <!-- FOOTER -->
 <footer>
-	Rom Patcher JS <small>rev20180920</small> by <a href="/">Marc Robledo</a>
+	Rom Patcher JS <small>rev20180926</small> by <a href="/">Marc Robledo</a>
 	<br />
 	<i class="icon github"></i> <a href="https://github.com/marcrobledo/RomPatcher.js/" target="_blank">See on GitHub</a>
 	<i class="icon heart"></i> <a href="https://www.paypal.me/marcrobledo/5" target="_blank" rel="nofollow">Donate</a>
diff --git a/ips.js b/ips.js
index 2c9d6d1..50e0be7 100644
--- a/ips.js
+++ b/ips.js
@@ -1,4 +1,4 @@
-/* IPS module for RomPatcher.js v20180919 - Marc Robledo 2016-2018 - http://www.marcrobledo.com/license */
+/* IPS module for RomPatcher.js v20180925 - Marc Robledo 2016-2018 - http://www.marcrobledo.com/license */
 /* File format specification: http://www.smwiki.net/wiki/IPS_file_format */
 
 var MAX_IPS_SIZE=16777216;
@@ -169,7 +169,7 @@ function createIPSFromFiles(original, modified){
 			/* force length to be 0xffff-6 bytes to keep IPS standard */
 			var nearbyDifference=true;
 			while(nearbyDifference && length<(0xffff-6)){
-				if(seek+6>modified.fileSize){
+				if((seek+6)>=modified.fileSize){
 					var finalSeek=modified.fileSize-seek-1;
 					length+=finalSeek;
 					seek+=finalSeek;