Kioo's output causes Safari browsers to hang when moderately complex HTML structures are used. There's a discussion of this issue on the news group here:
https://groups.google.com/forum/#!topic/enfocus/vfS63QhnRXs
A sample project that exhibits the issue is here:
https://github.com/OliverM/kiooform
This was encountered with Kioo 0.4.1 but 0.4.2 still shows the issue.
Creighton, you mentioned there that you'd encountered a similar issue previously, did you have a chance to capture what was going on there?