We have just released Theme Builder 4.2-RC1 - an early access release that provides Confluence 3.4 compatibility, among other fixes.
We advise all Theme Builder users on Confluence 3.3.x or 3.4.x to test out this latest release (all DWR components have been removed!) and let us know of any issues. All going well, we hope to make a final release next week.
Further details and the downloadable JAR are available here.