Description of problem:

Preinstall script from control-center-2.17.91-1.fc7 ends with
a status 1.  This has the following effects in yum:

Running Transaction
error: %pre(control-center-2.17.91-1.fc7.x86_64) scriptlet failed,
exit status 1
error:   install: %pre scriptlet failed (2), skipping control-center-2.17.91-1.fc7

Updated: control-center.x86_64 1:2.17.91-1.fc7
Complete!

The above would be fine if not the last two lines above and
a /var/log/yum entry which says:

Feb 14 14:13:10 Updated: control-center.x86_64 1:2.17.91-1.fc7

while 'rpm -q control-center' knows only about
control-center-2.17.90-6.fc7

Version-Release number of selected component (if applicable):
yum-3.1.1-2.fc7

How reproducible:
on every try