Simplify3D User Forum

I have a model that i cut a hole in the top and down about half way. When i import into S3D it appears correct, however, when i slice it the hole disappears and the top is solid. I checked all the settings and cant find anything to change. I think i had this problem in prev version figured out but cant remember how i fixed it. Can anyone help please? If your not sure what i mean, just think of the model as a skull and i want to insert a candle in the top.

Ahh, i found it, its the 'merge all outlines into a single solid model' under the Advanced tab, uncheck it. Tried that before posting but didnt work, tried again and it work, go figure.