Same problem here. The bug seems indipendent from the used theme. I opened a thread on ubuntuforums where I describe the bug with two screenshots.
http://ubuntuforums.org/showthread.php?p=2186790 -- Checkboxes in selected row not visible in Clearlooks theme https://launchpad.net/bugs/85829 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
