Go to http://trolltech.com/qt-in-use/story/customer/midland-valley-exploration-ltd try to select words from the big bold "Midland Valley Exploration Ltd." with double click. Clicking eg. on the "E" selects "ey Exp", "ti" select "ration" and the middle "o" from Exploration select only itself. I have revision 873264.
Looks like a duplicate to me. *** This bug has been marked as a duplicate of bug 166241 ***