Hidden object in Twilight Render

Hello there, i never have seen same ‘‘bug’’ if it is bug, i dont know. i work for a model, i saved it and close. after i open it again and start render for test, i saw thi white form. i have not idea what is this, unhide everything (hidden objects, hidden geometry) but can not find what is this. anyone have an idea how to find / remove it from my model?

What renderer are you using?

Are you willing/able to share the model with us? Lacking that, the only hope you have for an answer is if someone has seen the same symptoms in one of their renders and found the cause.

twilight render

i will try to upload it tomorrow (if problem will not be fixed) thanks