I've taken a 2.2.2 database backup (with mysql 4.0 compat enabled, export to sql/zip), restored to 2.3.5 installation with MySQL 5 db on debian. Ran dev/build, result looked Ok, no errors.
Existing usernames/passwords no longer worked, so I changed _config.php to let me login as admin. (not so worried about this, only a handful of users I can recreate).
The structure of the pages looks different, and I'd even say it looks like every page has reverted back to "version 1". Therefore the new site content looks like the first 'cut' and all the changes since are not showing.
I've searched the forums and Google to no avail, any advice apprecaited !