Version:            (using KDE KDE 3.2.2)
Installed from:    Gentoo Packages
Compiler:          gcc version 3.3.2 20031218 (Gentoo Linux 3.3.2-r5, propolice-3.3-7)
 Reading specs from /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.2/specs
Configured with: /var/tmp/portage/gcc-3.3.2-r5/work/gcc-3.3.2/configure --prefix=/usr --bindir=/usr/i686-pc-linux-gnu/gcc-bin/3.3 --includedir=/usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.2/include --datadir=/usr/share/gcc-data/i686-pc-linux-gnu/3.3 --mandir=/usr/share/gcc-data/i686-pc-linux-gnu/3.3/man --infodir=/usr/share/gcc-data/i686-pc-linux-gnu/3.3/info --enable-shared --host=i686-pc-linux-gnu --target=i686-pc-linux-gnu --with-system-zlib --enable-languages=c,c++,f77,objc,java --enable-threads=posix --enable-long-long --disable-checking --enable-cstdio=stdio --enable-clocale=generic --enable-__cxa_atexit --enable-version-specific-runtime-libs --with-gxx-include-dir=/usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.2/include/g++-v3 --with-local-prefix=/usr/local --enable-shared --enable-nls --without-included-gettext --x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib --enable-interpreter --enable-java-awt=xlib --with-x --disable-multilib
Thread m
OS:                Linux

When using the middle button to "Open Link in new tab"  doing so on a PDF causes the following bug:

Click on a link to a PDF with the middle button (so that it opens to another tab) keep browsing for a moment (i.e. wait for the PDF to finish downloading), switch tabs.  The zoom controls (the magnifier buttons with the +/- and the zoom percentage chooser on the toolbar) are greyed out. Hitting the reload button will cause the PDF to reload and then the zoom controls will un-grey just after the PDF renders and will work as normal.  

Seems that if that tab isn't the most forward one when loading a PDF the zoom controls are left greyed inadvertantly.

If a PDF is loaded in the active browser window/tab (i.e. not in a new tab) the zoom controls are initially greyed as the PDF is downloaded but un-grey when the PDF is rendered.

This bug is readily reproducable.