The fact is, the image which is saved in /opt/usr/share/themes/current-theme-name/images/LockSliderThumb.png, is different from the default image, and yet, the lockscreen continues to display the default-theme slider. The background (800x480) changes, all right and dandy, but the lockslider (thumb, thumbportrait, left, right, top and bottom) is displayed from the default theme, even when all /opt/usr/share/themes/current-theme-name/images/LockSlider*.png files are changed-replaced-modified. Even full reboot doesn't fix that problem. What on earth is going on?
Quarks are easier to understand... Let's see: up and down, top (truth) and bottom (beauty), strange and charm. See? I can recite them off the top of my head when woken in the middle of the night; many people can, I expect. But the slider... is troublesome.
Maybe, you are right, it's fault of hildon-desktop; I am using CSSU-Testing, after all, and you are likely using CSSU-Devel. But how does the problem persist even after reboot?..
Best wishes.
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Per aspera ad astra...