User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0) Gecko/20100101 Firefox/9.0 Build ID: 20120114215613 Steps to reproduce: Go here: http://mathscribe.com/author/jqmath.html Look at the attached picture. Drag pointer from green to blue dot. Actual results: There is a glitch in the rendering Expected results: No glitch

More data: The bug appears iff the two integrals have different sizes Asked a few people: reproduced on 9.0 on gentoo [me] 9.0.1 on arch not reproduced on 9.0.1 on ubuntu 9.0.1 on windows 7

I think you don't have STIX fonts installed and thus Firefox uses a scale transform to draw integrals. When I implemented this method, I found painting issues, but I can not currently reproduce the bug.

Yes, I don't have stix-fonts installed. Anything I can do to help you reproduce or at least triage the bug?

I know Gentoo builds with --enable-system-cairo. Does arch also do that? Check about:buildconfig. This is likely a duplicate of bug 518172.

(In reply to cmt.miniBill from comment #3) > Yes, I don't have stix-fonts installed. > Anything I can do to help you reproduce or at least triage the bug? What does about:buildconfig give for you?

about:buildconfig Build platform target x86_64-pc-linux-gnu Build tools Compiler Version Compiler flags x86_64-pc-linux-gnu-gcc gcc version 4.5.3 (Gentoo 4.5.3-r1 p1.0, pie-0.4.5) -Wall -W -Wno-unused -Wpointer-arith -Wdeclaration-after-statement -Wcast-align -W -march=native -pipe -mno-avx -fno-strict-aliasing -pthread -ffunction-sections -fdata-sections -pipe -DNDEBUG -DTRIMMED -g -Os -freorder-blocks -finline-limit=50 -fomit-frame-pointer x86_64-pc-linux-gnu-g++ gcc version 4.5.3 (Gentoo 4.5.3-r1 p1.0, pie-0.4.5) -fno-rtti -fno-exceptions -Wall -Wpointer-arith -Woverloaded-virtual -Wsynth -Wno-ctor-dtor-privacy -Wno-non-virtual-dtor -Wcast-align -Wno-invalid-offsetof -Wno-variadic-macros -Werror=return-type -march=native -pipe -mno-avx -fno-strict-aliasing -std=gnu++0x -pthread -ffunction-sections -fdata-sections -pipe -DNDEBUG -DTRIMMED -g -Os -freorder-blocks -finline-limit=50 -fomit-frame-pointer Configure arguments --enable-application=browser --enable-optimize --with-system-jpeg --with-system-zlib --enable-pango --enable-svg --enable-system-cairo --disable-installer --disable-pedantic --disable-updater --disable-strip --disable-strip-libs --disable-install-strip --enable-single-profile --disable-profilesharing --disable-profilelocking --enable-default-toolkit=cairo-gtk2 --enable-official-branding --enable-ogg --enable-wave --enable-crashreporter --enable-dbus --disable-debug --disable-tests --disable-debugger-info-modeules --enable-ipc --enable-libnotify --enable-startup-notification --disable-system-sqlite --disable-necko-wifi --enable-webm --with-system-libvpx=/usr --enable-tracejit --with-system-nspr --with-nspr-prefix=/usr --with-system-nss --with-nss-prefix=/usr --x-includes=/usr/include --x-libraries=/usr/lib64 --with-system-libevent=/usr --enable-system-hunspell --disable-gnomevfs --disable-gnomeui --enable-gio --enable-storage --enable-places --enable-places_bookmarks --enable-oji --enable-mathml --disable-mochitest --prefix=/usr --libdir=/usr/lib64 --disable-gconf --disable-mailnews --enable-canvas --enable-safe-browsing --with-system-png --enable-system-ffi --with-default-mozilla-five-home=/usr/lib64/firefox --target=x86_64-pc-linux-gnu --disable-system-sqlite --enable-extensions=default

Removing --enable-system-cairo should fix this.