Did you have AutoMOD installed on your board previously? The installer checks for the existence of the 'automod_version' entry in the phpbb_config table when deciding whether to perform an update or a full install.
If the automod_version is set, then AutoMOD will do an upgrade, which, for most versions of AutoMOD, means only changing the version number.
Can you check whether this is present with phpMyAdmin or some similar tool?
A Donut's Blog
"Bach's Prelude (Cello Suite No. 1) is driving Indiana country roads in Autumn" - Ann Kish