Bug#697541: iceweasel: weird rendering on Youtube and sites with similar design features

[Andrew Shadura]

Package: iceweasel
Version: 18.0~b2-2
Severity: normal

I have seen this behaviour for many previous versions, and on current,
previous, and some experimental YouTube designs. The symptoms are
similar every time: certain blocks disappear, text gets half-rendered or
doesn't render at all. I've encountered similar issues on some other
websites with a fixed bar at the top of the screen, namely, some themes
for Twitter cause it (sorry, can't find links at this moment).

Mostly it looks like:

http://img163.imageshack.us/img163/3748/20130106180401380x42scr.png

Sometimes the whole page becomes unusable:

http://img29.imageshack.us/img29/720/201301061804361400x735s.png

But if it's scrolled a bit, elements get redrawn again:

http://img189.imageshack.us/img189/1019/201301061805091043x171s.png

However, they may disappear in few seconds again, and I have to scroll
the page back and forth.

-- System Information:
Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: i386 (i686)

Kernel: Linux 3.6-trunk-686-pae (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_GB.UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages iceweasel depends on:
ii  debianutils         4.0.2
ii  fontconfig          2.8.0-3
ii  libc6               2.13-35
ii  libgcc1             1:4.7.1-5
ii  libgdk-pixbuf2.0-0  2.26.0-1
ii  libglib2.0-0        2.34.1-1
ii  libgtk2.0-0         2.24.13-1
ii  libnspr4            2:4.9.2-1
ii  libnspr4-0d         2:4.9.2-1
ii  libsqlite3-0        3.7.13-1
ii  libstdc++6          4.7.1-5
ii  procps              1:3.3.3-2
ii  xulrunner-18.0      18.0~b2-2

iceweasel recommends no packages.

Versions of packages iceweasel suggests:
ii  fonts-stix [otf-stix]  1.1.0-1
ii  libgssapi-krb5-2       1.10+dfsg~beta1-2
ii  mozplugger             1.14.5-1

Versions of packages xulrunner-18.0 depends on:
ii  libasound2                1.0.25-4
ii  libatk1.0-0               2.2.0-2
ii  libbz2-1.0                1.0.5-3
ii  libc6                     2.13-35
ii  libcairo2                 1.10.2-2
ii  libdbus-1-3               1.4.16-1
ii  libdbus-glib-1-2          0.98-1
ii  libevent-2.0-5            2.0.19-stable-3
ii  libfontconfig1            2.9.0-3
ii  libfreetype6              2.4.2-2.1
ii  libgcc1                   1:4.7.1-5
ii  libgdk-pixbuf2.0-0        2.26.0-1
ii  libglib2.0-0              2.34.1-1
ii  libgtk2.0-0               2.24.13-1
ii  libhunspell-1.3-0         1.3.2-4
ii  libmozjs18d               18.0~b2-2
ii  libnspr4                  2:4.9.2-1
ii  libnspr4-0d               2:4.9.2-1
ii  libnss3                   2:3.14-1
ii  libpango1.0-0             1.30.0-1
ii  libpixman-1-0             0.22.2-1
ii  libsqlite3-0              3.7.13-1
ii  libstartup-notification0  0.10-1
ii  libstdc++6                4.7.1-5
ii  libvpx1                   1.0.0-1
ii  libx11-6                  2:1.4.99.901-2
ii  libxext6                  2:1.2.0-2
ii  libxrender1               1:0.9.4-2
ii  libxt6                    1:1.0.6-1
ii  zlib1g                    1:1.2.7.dfsg-13

Versions of packages xulrunner-18.0 suggests:
ii  libcanberra0  0.24-1
ii  libgnomeui-0  2.24.1-1

-- no debconf information