I have created a liquid sub-theme with Zenophile 6.x-2.0. In the second sidebar I created a block with a picture. When resizing the browser window, this picture should glide behind the node content. So I gave the block a z-index value which is lower than the node content. All looked fine while I was logged in as a user. When I logged out, the picture came to the front, overlapping the node content.
I have tried a z-index of -999, created a new block, even build a new site from scratch, but the problem stays. This problem does not occur in a fixed lay-out.
So when I log in, I can work with z-index, but logged out, the z-index does not seem to work.
Does anyone have a clue?