After the latest steam client update the client fails to startup with 'Failed to load steamui.so'

Platform: ubuntu 12.04.3 LTS x86_64
OpenGL drivers: AMD Catalyst 13.11 beta6

To try to narrow the Issue down I have tried various older drivers. Steam client always fails in the same way. Using an older client configuration restoredfrom backup the client starts successfully until it self-updates at which point the failure recurs.

A quick ldd shows no obviously missing libraries.

as@mouldy:~/.local/share/Steam$ LD_LIBRARY_PATH=pwd/ubuntu12_32:$LD_LIBRARY_PATH ldd ./ubuntu12_32/steamui.so
linux-gate.so.1 => (0xf77cf000)
libcef.so => /home/as/.local/share/Steam/ubuntu12_32/libcef.so (0xf3810000)
liboverride.so => /home/as/.local/share/Steam/ubuntu12_32/liboverride.so (0xf3808000)
libsteam.so => /home/as/.local/share/Steam/ubuntu12_32/libsteam.so (0xf34c0000)
libtier0_s.so => /home/as/.local/share/Steam/ubuntu12_32/libtier0_s.so (0xf3490000)
libvstdlib_s.so => /home/as/.local/share/Steam/ubuntu12_32/libvstdlib_s.so (0xf3448000)
libSDL2-2.0.so.0 => /home/as/.local/share/Steam/ubuntu12_32/libSDL2-2.0.so.0 (0xf3360000)
libXrandr.so.2 => /usr/lib/i386-linux-gnu/libXrandr.so.2 (0xf3318000)
libXext.so.6 => /usr/lib/i386-linux-gnu/libXext.so.6 (0xf3300000)
libX11.so.6 => /usr/lib/i386-linux-gnu/libX11.so.6 (0xf31c8000)
libGL.so.1 => /usr/lib32/fglrx/libGL.so.1 (0xf3128000)
libpangoft2-1.0.so.0 => /usr/lib/i386-linux-gnu/libpangoft2-1.0.so.0 (0xf30f8000)
libpango-1.0.so.0 => /usr/lib/i386-linux-gnu/libpango-1.0.so.0 (0xf30a8000)
libfreetype.so.6 => /usr/lib/i386-linux-gnu/libfreetype.so.6 (0xf3008000)
libfontconfig.so.1 => /usr/lib/i386-linux-gnu/libfontconfig.so.1 (0xf2fd0000)
libgobject-2.0.so.0 => /usr/lib/i386-linux-gnu/libgobject-2.0.so.0 (0xf2f80000)
libglib-2.0.so.0 => /lib/i386-linux-gnu/libglib-2.0.so.0 (0xf2e80000)
libgio-2.0.so.0 => /usr/lib/i386-linux-gnu/libgio-2.0.so.0 (0xf2d28000)
libgtk-x11-2.0.so.0 => /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0 (0xf28c0000)
librt.so.1 => /lib/i386-linux-gnu/librt.so.1 (0xf28b0000)
libpulse.so.0 => /usr/lib/i386-linux-gnu/libpulse.so.0 (0xf2860000)
libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xf2830000)
libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xf2828000)
libstdc++.so.6 => /usr/lib/i386-linux-gnu/libstdc++.so.6 (0xf2740000)
libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xf2720000)
/lib/ld-linux.so.2 (0xf77d0000)
libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf2570000)
libgdk-x11-2.0.so.0 => /usr/lib/i386-linux-gnu/libgdk-x11-2.0.so.0 (0xf24c0000)
libpangocairo-1.0.so.0 => /usr/lib/i386-linux-gnu/libpangocairo-1.0.so.0 (0xf24b0000)
libgdk_pixbuf-2.0.so.0 => /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0 (0xf2488000)
libcairo.so.2 => /usr/lib/i386-linux-gnu/libcairo.so.2 (0xf23b8000)
libXi.so.6 => /usr/lib/i386-linux-gnu/libXi.so.6 (0xf23a8000)
libasound.so.2 => /usr/lib/i386-linux-gnu/libasound.so.2 (0xf22b0000)
libXrender.so.1 => /usr/lib/i386-linux-gnu/libXrender.so.1 (0xf22a0000)
libnss3.so => /usr/lib/i386-linux-gnu/libnss3.so (0xf2170000)
libnssutil3.so => /usr/lib/i386-linux-gnu/libnssutil3.so (0xf2148000)
libsmime3.so => /usr/lib/i386-linux-gnu/libsmime3.so (0xf2118000)
libplc4.so => /usr/lib/i386-linux-gnu/libplc4.so (0xf2110000)
libnspr4.so => /usr/lib/i386-linux-gnu/libnspr4.so (0xf20d0000)
libz.so.1 => /lib/i386-linux-gnu/libz.so.1 (0xf20b8000)
libdbus-1.so.3 => /lib/i386-linux-gnu/libdbus-1.so.3 (0xf2068000)
libpng12.so.0 => /lib/i386-linux-gnu/libpng12.so.0 (0xf2038000)
libXfixes.so.3 => /usr/lib/i386-linux-gnu/libXfixes.so.3 (0xf2030000)
libcups.so.2 => /usr/lib/i386-linux-gnu/libcups.so.2 (0xf1fd8000)
libgcrypt.so.11 => /lib/i386-linux-gnu/libgcrypt.so.11 (0xf1f50000)
libgcc_s.so.1 => /lib/i386-linux-gnu/libgcc_s.so.1 (0xf1f30000)
libXcursor.so.1 => /usr/lib/i386-linux-gnu/libXcursor.so.1 (0xf1f20000)
libXinerama.so.1 => /usr/lib/i386-linux-gnu/libXinerama.so.1 (0xf1f18000)
libXss.so.1 => /usr/lib/i386-linux-gnu/libXss.so.1 (0xf1f10000)
libXxf86vm.so.1 => /usr/lib/i386-linux-gnu/libXxf86vm.so.1 (0xf1f08000)
libxcb.so.1 => /usr/lib/i386-linux-gnu/libxcb.so.1 (0xf1ee0000)
libatiuki.so.1 => /usr/lib32/fglrx/libatiuki.so.1 (0xf1ec0000)
libgmodule-2.0.so.0 => /usr/lib/i386-linux-gnu/libgmodule-2.0.so.0 (0xf1eb8000)
libexpat.so.1 => /lib/i386-linux-gnu/libexpat.so.1 (0xf1e88000)
libffi.so.6 => /usr/lib/i386-linux-gnu/libffi.so.6 (0xf1e80000)
libpcre.so.3 => /lib/i386-linux-gnu/libpcre.so.3 (0xf1e40000)
libselinux.so.1 => /lib/i386-linux-gnu/libselinux.so.1 (0xf1e20000)
libresolv.so.2 => /lib/i386-linux-gnu/libresolv.so.2 (0xf1e08000)
libatk-1.0.so.0 => /usr/lib/i386-linux-gnu/libatk-1.0.so.0 (0xf1de8000)
libjson.so.0 => /usr/lib/i386-linux-gnu/libjson.so.0 (0xf1de0000)
libpulsecommon-1.1.so => /usr/lib/i386-linux-gnu/libpulsecommon-1.1.so (0xf1d78000)
libXcomposite.so.1 => /usr/lib/i386-linux-gnu/libXcomposite.so.1 (0xf1d70000)
libXdamage.so.1 => /usr/lib/i386-linux-gnu/libXdamage.so.1 (0xf1d68000)
libpixman-1.so.0 => /usr/lib/i386-linux-gnu/libpixman-1.so.0 (0xf1cd0000)
libxcb-shm.so.0 => /usr/lib/i386-linux-gnu/libxcb-shm.so.0 (0xf1cc8000)
libxcb-render.so.0 => /usr/lib/i386-linux-gnu/libxcb-render.so.0 (0xf1cb8000)
libplds4.so => /usr/lib/i386-linux-gnu/libplds4.so (0xf1cb0000)
libgssapi_krb5.so.2 => /usr/lib/i386-linux-gnu/libgssapi_krb5.so.2 (0xf1c70000)
libgnutls.so.26 => /usr/lib/i386-linux-gnu/libgnutls.so.26 (0xf1ba8000)
libavahi-common.so.3 => /usr/lib/i386-linux-gnu/libavahi-common.so.3 (0xf1b98000)
libavahi-client.so.3 => /usr/lib/i386-linux-gnu/libavahi-client.so.3 (0xf1b80000)
libgpg-error.so.0 => /lib/i386-linux-gnu/libgpg-error.so.0 (0xf1b78000)
libXau.so.6 => /usr/lib/i386-linux-gnu/libXau.so.6 (0xf1b70000)
libXdmcp.so.6 => /usr/lib/i386-linux-gnu/libXdmcp.so.6 (0xf1b68000)
libwrap.so.0 => /lib/i386-linux-gnu/libwrap.so.0 (0xf1b58000)
libsndfile.so.1 => /usr/lib/i386-linux-gnu/libsndfile.so.1 (0xf1ae0000)
libasyncns.so.0 => /usr/lib/i386-linux-gnu/libasyncns.so.0 (0xf1ad8000)
libkrb5.so.3 => /usr/lib/i386-linux-gnu/libkrb5.so.3 (0xf1a08000)
libk5crypto.so.3 => /usr/lib/i386-linux-gnu/libk5crypto.so.3 (0xf19e0000)
libcom_err.so.2 => /lib/i386-linux-gnu/libcom_err.so.2 (0xf19d8000)
libkrb5support.so.0 => /usr/lib/i386-linux-gnu/libkrb5support.so.0 (0xf19c8000)
libtasn1.so.3 => /usr/lib/i386-linux-gnu/libtasn1.so.3 (0xf19b0000)
libp11-kit.so.0 => /usr/lib/i386-linux-gnu/libp11-kit.so.0 (0xf1998000)
libnsl.so.1 => /lib/i386-linux-gnu/libnsl.so.1 (0xf1978000)
libFLAC.so.8 => /usr/lib/i386-linux-gnu/libFLAC.so.8 (0xf1928000)
libvorbisenc.so.2 => /usr/lib/i386-linux-gnu/libvorbisenc.so.2 (0xf17b0000)
libvorbis.so.0 => /usr/lib/i386-linux-gnu/libvorbis.so.0 (0xf1780000)
libogg.so.0 => /usr/lib/i386-linux-gnu/libogg.so.0 (0xf1778000)
libkeyutils.so.1 => /lib/i386-linux-gnu/libkeyutils.so.1 (0xf1770000)