Hi John
I've taken a look at the file and can't see anything that stands out as to why your workbook is behaving this way. The structure is very simple and straightforward, no macros / links or anything else that could complicate matters. Therefore I created a new workbook and used the Edit > Move or Copy Sheet function to copy the sheets to the new workbook and reset the password. All the controls are now shown in the Control Toolbox. I can only assume that sometime in the file's history there has been some setting that Excel has not properly cleared for some reason, or some corruption of the data comprising the file that has lead to this.
Remember to check that this file now behaves exactly as it should before replacing the original. I would suggest you keep a copy of the original file as a backup.
Reconstructed file attached. I will post this e-mail into your thread.
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