We are using Confluence 3.0.0_01 with Themebuilder 3.3.5-conf210.
In any space with a Themebuilder theme on it, search auto-completion doesn't work, and nor does the business-card hover functionality (sorry, thats not what Atlassian call it, but its where you get a pop-up 'business card' appear when you hover over someone's name.)
Both features work fully when NOT in a ThemeBuilder theme.
Is there something I need to turn on ? I suspect that there are one or two files I need to copy over into the theme space and link in, but figuring out what those files are is beyond me !