Macs default-buttons from SUT no more blue

After switching from OSX 10.4 to 10.5, the normaly blue default-buttons from SUT are no more blue (pulsing blue). So our scripts will fail.

The Eggplant 4.01 and 4.1 are on the same MacPro as the SUT (in an other user). For vine Server we have tested with version 3.0 and the 3.1Beta.

When we switch with fast-user-switching to the SUT, we se the blue default-buttons. After switching back into the user with the eggplant, we see also the blue button now, but only for one time - in the following dialogboxes they are no more blue again.

Maybe someone any idea?

Have you tried to use the Image Doctor to identify if there are other search options that will identify the images?