After the last cooker update applications like firestarter, smart,
rpmdrake and drakconf are unable to start because they are unable to
interpret png image files. Thunderbird and firefox have the same issue
but are able to run by replacing the file image they can't read with a
default. Do I need to reinstall a package that may have been updated to
rectify this, and if so which one?

The error message from smart is:

Couldn't recognise the image file format for file
'/usr/lib/python2.5/site-packages/smart/interfaces/images/smart.png'

The error messages from rpmdrake are:

Error loading theme icon 'gtk-missing-image' for stock: Unrecognised
image file format
Couldn't recognise the image file format for file
'/usr/lib/libDrakX/icons/drakbug-16.png' at /usr/lib/libDrakX/mygtk2.pm
line 294.

regards,
Steve