Thread:Project:Support desk/Mass disappearance of pages in mediawiki upgrade

Greetings. I spent most of this weekend manually upgrading from 1.12 to 1.22.5. Finally, the wiki appears to be upgraded. However, almost all of the pages and images from 1.12 on the 1.22.5 install are missing. Also, when I got to Preferences, I get two error messages: Notice: Uncommitted DB writes (transaction from DatabaseBase::query (User::loadFromDatabase)). in /home2/babylon6/public_html/democraticvistas/includes/db/Database.php on line 3944

Notice: DB transaction callbacks still pending (from Title::invalidateCache). in /home2/babylon6/public_html/democraticvistas/includes/db/Database.php on line 3953

Wiki is here: http://democraticvistas.net/index.php?title=American_Literature_(1865_-_1914) MySQL version 5.5.36 PHP version 5.4.26

I'm not a tech person but have educated myself in the basics by working with Wordpress, BuddyPress, Mediawiki, etc. for five or six years. I'd like to make this install work. But, perhaps it is better to rewind and upgrade incrementally rather than in one great leap forward? In other words, help! Thanks in advance.