qt 4.8 font hinting is not "remembered"

I am using XFCE. I also have a few KDE apps running. I also use cairo-ubuntu, freetype2-ubuntu, fontconfig-ubuntu and libxft-ubuntu (ubuntu patched components for better looking fonts).
All was fine with my fonts until upgrade on 2011/12/22
These packages were upgraded:

[2011-12-22 18:51] starting full system upgrade
[2011-12-22 18:54] upgraded unixodbc (2.3.0-2 -> 2.3.1-1)
[2011-12-22 18:54] upgraded apr-util (1.3.12-3 -> 1.3.12-4)
[2011-12-22 18:54] upgraded firefox (9.0-1 -> 9.0.1-1)
[2011-12-22 18:54] upgraded qt (4.7.4-3 -> 4.8.0-2)
[2011-12-22 18:54] installed gperf (3.0.4-4)
[2011-12-22 18:54] installed qtwebkit (2.2.0-3)
[2011-12-22 18:54] upgraded kdelibs (4.7.4-1 -> 4.7.4-2)
[2011-12-22 18:54] upgraded redland (1:1.0.15-1 -> 1:1.0.15-2)
[2011-12-22 18:54] upgraded libreoffice-en-US (3.4.4-3 -> 3.4.4-4)
[2011-12-22 18:55] upgraded libreoffice-common (3.4.4-3 -> 3.4.4-4)
[2011-12-22 18:55] upgraded libreoffice-calc (3.4.4-3 -> 3.4.4-4)
[2011-12-22 18:55] upgraded libreoffice-extension-pdfimport (3.4.4-3 -> 3.4.4-4)
[2011-12-22 18:55] upgraded libreoffice-impress (3.4.4-3 -> 3.4.4-4)
[2011-12-22 18:55] upgraded libreoffice-writer (3.4.4-3 -> 3.4.4-4)
[2011-12-22 18:55] upgraded luminancehdr (2.1.0-5 -> 2.1.0-6)
[2011-12-22 18:55] upgraded pyqt (4.8.6-1 -> 4.8.6-2)
[2011-12-22 18:55] upgraded python2-pyqt (4.8.6-1 -> 4.8.6-2)
[2011-12-22 18:55] upgraded redland-storage-virtuoso (1:1.0.15-1 -> 1:1.0.15-2)
[2011-12-22 18:55] upgraded wine (1.3.35-1 -> 1.3.35-3)

Since then my KDE apps had different fonts. I do regular backups of my configuration and have not found any differences that would look like suspects (I suspect QT/KDE upgrade though) apart from contents of /etc/fonts/conf.d directory.
Setting fonts/conf.d directory back to previous settings did not solve the problem.

My KDE font hinting setting is set to slight. In XFCE I have it set to full. If I set it in /etc/fonts to full, I get no hinting.
If I set my hinting in KDE's system settings to enabled and full, it does not work as well. If I set it to slight the it works and I get the desired fonts look.
But when I log out of XFCE and log back in, KDE fonts are again bad. It appears to be set to slight in KDE settings. I have to set it to anything else and then back again to slight and prefered font is back until next logout.
What can I do to keep this settings and to have them when I start my system?

I hope this report is not completelly of, if so, I am sorry.