Jorge Gonzalez - 2005-05-16

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I had the same problem, however I found a tricky solution.

When you change any setting about syncronize prefs it doesn't ask to
"save the changes". It asks, however, if you change something else in
another tab such as "Mailbox Behavior".

Do this:
a) Change something (whatever) in the Mailbox Behavior tab.
b) click on another pane, such as "General". You will be asked to save
the changes. Save them.
c) Go back to "Accounts" pane and go to the "Advanced" tab. Select
the sync option that you want.
d) Go to the "Mailbox Behavior" tab and change back the setting that
you first changed (in step a)).
e) Close the window. Again, you will be asked if you want to save the
changes. Select "Save".

That's it.