When any of you get a chance would you try the following and see if you get incorrect results.
Size is not the issue this is just what I was using
1) Create a cube 1"Z x 1.250"Y x 6"X
2) put a 2"diam x 1"h cylinder in the center of x,y,z of cube
3) Put a 1"diam x 1"h cylinder in the center of the 2"
4) Use the Difference function to put the 1" hole through when rendering.
See if while rendering the hole does appear to go through on my system it does not.
I found a work around but am interested in seeing if it is possibly my video card, bug or just a onecncxp quirk.
Thanks
Ken