Bullet physics and constraints

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Hi all,
This should be a quick one. I've been trying to get some constraints to work with the Bullet solver, but without much luck. The RBD solver and constraints work great, but RBD is a touch slow.
I've looked at the help file in H12. Bullet is the default solver engine, so I thought that it would implement all the basic constraints. The help file also states “Currently, bullet does not work perfectly with spring constraint.” as a limitation of the Bullet solver, further implying that other constraints work ok.

However, if I try to apply an angular constraint, I get this error:
“the attempted operation failed.
Only RBD objects solved with the RBD engine are supported”
The scene linked below has a pin constraint, but it appears to be non-functional when using Bullet.

So, what is the deal with Bullet? Does it respect constraints or doesn't it? If it does, how do I get them to function?

NB: File for this is the same as another thread:
http://www.sidefx.com/index2.php?option=com_forum&Itemid=172&page=download&id=11201 [sidefx.com]
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