diff --git a/xlsx.js b/xlsx.js
index 50d8293..79a8038 100644
--- a/xlsx.js
+++ b/xlsx.js
@@ -498,7 +498,7 @@ SSF.load_table = function(tbl) { for(var i=0; i!=0x0188; ++i) if(tbl[i]) SSF.loa
 make_ssf(SSF);
 var XLSX = {};
 (function(XLSX){
-XLSX.version = '0.5.16';
+XLSX.version = '0.5.17';
 var current_codepage, current_cptable, cptable;
 if(typeof module !== "undefined" && typeof require !== 'undefined') {
 	if(typeof cptable === 'undefined') cptable = require('codepage');
@@ -1009,7 +1009,7 @@ var parse_sst_bin = function(data, opts) {
 var styles = {}; // shared styles
 
 /* 18.8.31 numFmts CT_NumFmts */
-function parseNumFmts(t) {
+function parseNumFmts(t, opts) {
 	styles.NumberFmt = [];
 	for(var y in SSF._table) styles.NumberFmt[y] = SSF._table[y];
 	t[0].match(/<[^>]*>/g).forEach(function(x) {
@@ -1020,13 +1020,13 @@ function parseNumFmts(t) {
 				var f=unescapexml(y.formatCode), i=parseInt(y.numFmtId,10);
 				styles.NumberFmt[i] = f; if(i>0) SSF.load(f,i);
 			} break;
-			default: throw 'unrecognized ' + y[0] + ' in numFmts';
+			default: if(opts.WTF) throw 'unrecognized ' + y[0] + ' in numFmts';
 		}
 	});
 }
 
 /* 18.8.10 cellXfs CT_CellXfs */
-function parseCXfs(t) {
+function parseCXfs(t, opts) {
 	styles.CellXf = [];
 	t[0].match(/<[^>]*>/g).forEach(function(x) {
 		var y = parsexmltag(x);
@@ -1040,25 +1040,25 @@ function parseCXfs(t) {
 			case '</xf>': break;
 
 			/* 18.8.1 alignment CT_CellAlignment */
-			case '<alignment': break;
+			case '<alignment': case '<alignment/>': break;
 
 			/* 18.8.33 protection CT_CellProtection */
 			case '<protection': case '</protection>': case '<protection/>': break;
 
 			case '<extLst': case '</extLst>': break;
 			case '<ext': break;
-			default: throw 'unrecognized ' + y[0] + ' in cellXfs';
+			default: if(opts.WTF) throw 'unrecognized ' + y[0] + ' in cellXfs';
 		}
 	});
 }
 
 /* 18.8 Styles CT_Stylesheet*/
-function parse_sty_xml(data) {
+function parse_sty_xml(data, opts) {
 	/* 18.8.39 styleSheet CT_Stylesheet */
 	var t;
 
 	/* numFmts CT_NumFmts ? */
-	if((t=data.match(/<numFmts([^>]*)>.*<\/numFmts>/))) parseNumFmts(t);
+	if((t=data.match(/<numFmts([^>]*)>.*<\/numFmts>/))) parseNumFmts(t, opts);
 
 	/* fonts CT_Fonts ? */
 	/* fills CT_Fills ? */
@@ -1066,7 +1066,7 @@ function parse_sty_xml(data) {
 	/* cellStyleXfs CT_CellStyleXfs ? */
 
 	/* cellXfs CT_CellXfs ? */
-	if((t=data.match(/<cellXfs([^>]*)>.*<\/cellXfs>/))) parseCXfs(t);
+	if((t=data.match(/<cellXfs([^>]*)>.*<\/cellXfs>/))) parseCXfs(t, opts);
 
 	/* dxfs CT_Dxfs ? */
 	/* tableStyles CT_TableStyles ? */