From d4d2cd508cbd89624a5b02250a78d3dcfa8af19b Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 20 Aug 2012 13:07:03 +0530
Subject: [PATCH] ...

---
 resources/compiled_coffeescript.zip         | Bin 56865 -> 57018 bytes
 src/calibre/ebooks/oeb/display/paged.coffee |   8 +++++---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/resources/compiled_coffeescript.zip b/resources/compiled_coffeescript.zip
index 1b22ec5b04170cc54e829f7a11e5cff2635db40a..3517cf1363c2d6b808de9b2fa7ecd4e1213d7fdd 100644
GIT binary patch
delta 317
zcmZ3uhk4gtW|;tQW)=|!5V)No;#gNwU?t<uzyQM143iJu5uMz7hhwAVQ@hD^JK5QF
z6yl3g(~Kv}*&8z})YMG&-qkue(7uAvX!1$>pvl$eR43azaETd3$7jY`b1A?9L{prD
z2DfpvL9C8KQD%BZ$>f=bq&Kf|kYZy7TD-ZWkT-F2dGIgU&5f7Na!$?<=Gc79Z6(iS
zzdKxfs1BQ)cE?%)B&2>uHu7cy0|N+4f;<2Rq3)9x-c_Ic=8haw>I$$Y<^^+1*1W65
zB(e?6^-biSya&jQKL+Ohy(_@N$Rxr%`GA`g58M<6lM6suMG;mukPsUX?q_6RczOrK
F0|1f}WuX87

delta 240
zcmdnBmwDkHX6XQLW)=|!5Rga~aV*}i?9lASzyQM1lLhX|ZM1x9H~D-E$7B<G?a7M{
z3Qv}C<(w?Ofq$}vjqGH72ZPB84ndO>y3`meCQoFQpZv=~mD@1dAXZ1AC^J2yWb*mB
z(wki!rPwyxU0BJpIei6_9CLS#(B>p}-o(wB$Ify}FfxfSW3ztp|2x)`Q}4+!?Qxr2
z=q@^W);*rd<##oha)T!?yz9;+lL!|5e^(r2-elXm(oE@vKq2YLT=%q?$}fRsCmiFO
NyyTt$o6jAP_W&RxQosNJ

diff --git a/src/calibre/ebooks/oeb/display/paged.coffee b/src/calibre/ebooks/oeb/display/paged.coffee
index a26f5931c9..4f912513a9 100644
--- a/src/calibre/ebooks/oeb/display/paged.coffee
+++ b/src/calibre/ebooks/oeb/display/paged.coffee
@@ -378,7 +378,9 @@ class PagedDisplay
         # The Conformal Fragment Identifier at the current position, returns
         # null if it could not be calculated. Requires the cfi.coffee library.
         ans = null
-        if not window.cfi?
+        if not window.cfi? or (window.mathjax?.math_present and not window.mathjax?.math_loaded)
+            # If MathJax is loading, it is changing the DOM, so we cannot
+            # reliably generate a CFI
             return ans
         if this.in_paged_mode
             c = this.current_column_location()
@@ -412,9 +414,9 @@ class PagedDisplay
         return ans
 
     click_for_page_turn: (event) ->
-        # Check if the click event event should generate a apge turn. Returns
+        # Check if the click event should generate a page turn. Returns
         # null if it should not, true if it is a backwards page turn, false if
-        # it is a forward apge turn.
+        # it is a forward page turn.
         left_boundary = this.current_margin_side
         right_bondary = this.screen_width - this.current_margin_side
         if left_boundary > event.clientX