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Description of problem:
I have no idea what happened, but suddenly the browser is unable to render some pages correctly. When I try to open such a page, almost no text is displayed correctly. No error dialog is displayed. The following error messages are printed to the console when I enter www.google.cz:
(firefox:8835): Pango-WARNING **: shaping failure, expect ugly output. shape-engine='BasicEngineFc', font='Liberation Sans 17.3330078125', text=' '
(firefox:8835): Pango-WARNING **: shaping failure, expect ugly output. shape-engine='BasicEngineFc', font='Liberation Sans Bold 17.3330078125', text='Vyhledávání'
(firefox:8835): Pango-WARNING **: shaping failure, expect ugly output. shape-engine='BasicEngineFc', font='Liberation Sans Bold 21.3330078125', text=' Česká republika'
...
I tried creating a new user profile, but that didn't help. I might also add that the problem originally occurred with a testing version of Firefox and the pango warnings weren't printed - instead, Firefox printed 'failed to create drawable'. When I downgraded to the latest public version in RHEL 6, the pango warnings started to occur.
Version-Release number of selected component (if applicable):
firefox-3.6.26-1.el6_2.i686
How reproducible:
Like I said, I don't know what triggered these problems. I haven't updated any rendering library, the X driver or the kernel recently. The hardware should be all right, though. Let me know if you need more information about the system.
e2fsck has healed the file system. I've reinstalled the font package, and Firefox is happy again.
Closing NOTABUG. Sorry about the false alarm. (Firefox could have helped me troubleshoot the problem better, though :)