Quote - I always change my bucket size depending on what I have in my scene. If there are lots of  figures, props etc, I will lower the buckets. Render time is slower but it's worth it if you want the render to be completed without any problem message coming up that you need to change render settings etc.

If you have Poser 6, it will change your bucket size for you if you have it set too big.
I usually set mine for 256 and let Poser decide if it likes that value or not.
It makes for a faster render even if Poser does drop it down to 16, because at
least the first part gets rendered with a large block. Unfortunately once it drops
the block size down, it doesn't increase it again.  Usually it is the head and hair
that cause the block size to go down, at that is usually at the top of the scene.
While the rest is easier and could use a large block size again.