@jbj – First, make a full verified back-up of your site, including the database.
It appears you may have reached a point where you will need to clear out the database of these old entries so that you can re-install NextGEN Gallery as a fresh instance.
There are three tables (using _ngg_) that should be dropped from the database and there are three more tables where NextGEN Gallery may have written information that will need to be cleared (do not drop these tables!!!): wp_options
, wp_postmeta
, and wp_usermeta
.
See if that gets you where you need to be … you should also delete the /gallery/
folder and the /ngg_styles/
folder from under /wp-content/
as well.
Thanks!
– Cais.