i recently deleted history, saved my project, closed and re-opened maya 2013. now, i want to unhide an object that i previously hid before saving and closing maya. the problem is, i'm now getting this little msg even though i press ctrl + shift + h to unhide the object. is there a way to fix this? thanks guys!
the solution was easy. i simply clicked on the hidden object under the "Outliner" in the Window menu and on the Attribute Editor options under Display, just checked the Visibility check box to unhide it. i can still use ctrl + h and ctrl + shift + h to unhide after doing this. don't know why it wouldn't unhide before though. anyways, that's was what i did.
Your problem is that Ctrl+shift+h is the hotkey for Show LAST hidden, when there may have been other operations that removed maya's memory of what was last hidden. Shift+h is the hotkey for show selected.
Just thought I'd point it out, since you'll likely run into it again.
Edit: Ah, yes, just re-read your original post. Closing maya and re-opening it will indeed remove maya's memory of what was last hidden.