Hi Jonah,

> By default, all the surfacing tools now output creased surfaces.

This is only on your own individual Rhino copy due to a non-default registry setting:
http://news2.mcneel.com/scripts/dnewsweb.exe?cmd=article&group=rhino&item=236335&utag=

A regular default install will not behave that way.

It looks like a few others ran into it accidentally, there must have been some bug that randomized settings a bit during repeated V4 beta new version installs or something...

Historically there have been various problems with having kinked single surfaces in Rhino, for example anything involving intersections used to not work properly with them. It looks like most of that has been solved, but there still can be a couple of side-effects from using them: http://news2.mcneel.com/scripts/dnewsweb.exe?cmd=article&group=rhino&item=236264&utag= , and some other things just aren't really made with them in mind yet, for instance explode will not blow a kinked surface into separate faces which you would normally expect to be able to do...

- Michael