Using Arora and Rekonq with Qt 4.5.2, there are several icon-buttons for actions such as marking duplicate bugs. To reproduce: -Go to https://bugs.edge.launchpad.net/ubuntu/+bug/390519 or any Launchpad bug that is marked as a duplicate of another bug. Next to the "Duplicate of bug #392593" there should be a yellow edit button similar to the one next to the bug summary. (This happens to be right above the duplicate text, too) This also occurs for a privacy toggle button that brings up an ajax dialog, but you can't see that unless you're part of the Ubuntu bug squad. Here is a slightly different, but perhaps related issue. (Just ask and I can file this separately) In the bug lists, (https://bugs.edge.launchpad.net/ubuntu/+source/plasma-widget-networkmanagement) the leftmost column should have little colored insect icons, but those are conspicuously gone, too.
..and that first sentence should be: "Using Arora and Rekonq with Qt 4.5.2, there are several icon-buttons for actions such as marking duplicate bugs which are missing."
Confirmed in WebKit trunk (r48110), against both Qt 4.6 (77fd77d6) and Qt 4.5.3, on Mac OS 10.5
I can also reproduce this with Google Chromium 4.0.223.6
They seem to have worked around this in newer versions of Launchpad. I suppose since a testcase was never made that it won't really be worth it to continue tracking this.