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GoZ Error

Hey all,
I have a model that I built the base mesh in Maya, used GoZ to take it into Zbrush. I have since sculpted on it and saved in increments. Now when I try to use GoZ to take it back to Maya I get an error message (posted below). If i go back and use a very early mesh it works, later versions do not. I have added some items to the model with zspheres and they transfer to with goz ok as long as they have depth.

here is the error message i get in the script editor:
// Warning: Errors have occurred while reading this scene that may result in data loss.
Please check the Script Editor for details. //
// File read in 0 seconds.
select -r female_testmesh5 ;
displaySmoothness -divisionsU 0 -divisionsV 0 -pointsWire 4 -pointsShaded 1 -polygonObject 1;
subdivDisplaySmoothness -smoothness 1;
select -r female_testmesh2 female_testmesh5 ;
doDelete;
// Error: file: /Users/Shared/Pixologic/GoZ_Projects/Default/female_engineer1.ma line 71: Error reading data element number 1: na //
// Error: file: /Users/Shared/Pixologic/GoZ_Projects/Default/female_engineer1.ma line 73: Error reading data element number 1: na //
// Error: file: /Users/Shared/Pixologic/GoZ_Projects/Default/female_engineer1.ma line 75: Error reading data element number 1: na //
// Error: file: /Users/Shared/Pixologic/GoZ_Projects/Default/female_engineer1.ma line 77: Error reading data element number 1: na //
// Error: file: /Users/Shared/Pixologic/GoZ_Projects/Default/female_engineer1.ma line 79: Error reading data element number 1: na //
// Error: file: /Users/Shared/Pixologic/GoZ_Projects/Default/female_engineer1.ma line 81: Error reading data element number 1: na //
// Error: file: /Users/Shared/Pixologic/GoZ_Projects/Default/female_engineer1.ma line 83: Error reading data element number 1: na //
// Error: file: /Users/Shared/Pixologic/GoZ_Projects/Default/female_engineer1.ma line 85: Error reading data element number 1: na //
// Error: file: /Users/Shared/Pixologic/GoZ_Projects/Default/female_engineer1.ma line 87: Error reading data element number 1: na //
// File read in 0 seconds.
// Warning: Errors have occurred while reading this scene that may result in data loss.

any thoughts on this?

THank you,
Doug

a follow up that maybe someone knows an answer to. I have tried exporting from z as an .obj and importing into Maya. Maya shows the model is there, but I cant see it. it even shows the face count on the model. is there a setting that is making this import so small you cant see it? My Maya setting are for cm, so it would need to be awfully small. I also tried scaling in maya and could never see anything.

thanks for any input.

ok, so this is odd. I put in a generic shape, the star, that comes with z, and appended my model to the star, did GoZ, and it transferred into Maya with no problem.

Any ideas on this newest revelation?

i have the same error with the DemoHead; in maya the script editor says it lose things because an error of renaming "Edits on ‘2_lightLinker1’ may have been lost as a result of renaming. We strongly recommend the use of Namespaces to resolve Name Clashes. // "