no i mean the cave near where i found the diadem

Are you using the mouse to move? For some reason, that cave entrance doesn't like the mouse very much. Try using your arrow keys, instead, and press Spacebar or Enter when you are facing the entrance.

thanks it workt

You're welcome

That issue has been fixed in build B, which you can just download and install over the top of build A

I found a chest that when opened says, "chest is empty". I visited the goodie caves before encountering that particular chest. Is it empty because the item that was supposed to be inside could be found in the goodie cave?

Yes, if you went to the goodie cave before going to that chest, it'll be empty and vice versa.

That's the chest that would normally have Nox's Disease spell. If you got the spell from the goodie cave, or Nox is no longer in the party, that chest will be empty. Likewise, if you got the spell from the chest in the Demon Plains or Nox is no longer with you, the chest in the goodie cave will be empty.