ZBrushCentral

Weird hole in model

Hi! First, sorry for the newbie question. Im completely new to Zbrush,
and Ive got a problem. I saved my Ztool of an egyptian mask, and
when I opened it again, a very strange hole appeared inside it. When I
go to lower subdivision, its still there and worse, when I try to go back
to higher, the model becomes a really scary mess :smiley: somebody can please help me and tell me what I did wrong? Because when saving the tool it was completely ok. Thank you very much for any reply,
Clockie
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difficult to say, what did you do overall?
also maybe that hole part is just hidden. look here:
http://www.zbrush.info/docs/index.php/Hiding_and_Showing_Model_Parts