I have a workbook with an 'entry' sheet for user input, which is protected.
Several cells on the sheet are unlocked to allow user input, the rest have
been locked.

I also have several macros which change various parts of the sheet based on
user input, and so in order to do this they call the Worksheet.Unprotect
method, do their thing, and then call Worksheet.Protect. Some also need to
call the Unprotect/Protect methods of the active workbook, in order to hide
and unhide other sheets.

The problem I am having is that some of the cells which are unlocked for
user input are suddenly locking for no apparent reason, requiring this option
to be changed manually, which some users (and me) find somewhat frustrating.
I am also worried by the fact that this means the sheet has to be manually
unprotected and protected, leaving it open to the type of security issue
protection was put in to avoid. Does anyone know of any reason why this may
be happening? I'm thinking that the difference between the VBA Protect method
and Excel's Protect command may be an issue, but I don't know much about
either.

Any thoughts?

--
There are 10 types of people in the world - those who understand binary and
those who don't.