x11-libs/qt-4.3.1-r1 installs the documentation to /usr/share/doc/qt-4.3.1-r1/. But Assistant is looking for these files in /usr/share/doc/qt-4.3.1/. So i always get errors the documentation could not be found. Reproducible: Always
Sorry,that's NOT a bug, just my fault :) I had to remove ~/.config/Trolltech/Assistant.conf, and all docs are found.
Thanks for reporting back. :)