I have update to mysql 5.0.26 but now DBD-mysql (stable 2.9007 and unstable 3.0007 version) not work : in my mail log i have "TROUBLE in process_request: Transaction not supported by database at /usr/lib/perl5/vendor_perl/5.8.8/i686-linux-thread-multi/DBI.pm line 1657, <GEN7> line 15."
See http://bugs.mysql.com/bug.php?id=21829. Might also be the problem for qt-3.3.6 <-> mysql-5.0.26 that is being seen here: http://forums.gentoo.org/viewtopic-p-3665630.html#3665630
This bug also affects mysql python bindings: http://bugs.mysql.com/bug.php?id=21543 Seperate bug report needed? Sorry if it does. :/
Cleaning up old bugs; this was fixed upstream some time ago, sorry for leaving this open.