I upgraded the Mollom module on this site from the 7.1.x version to the newer branch of 7.2.x and ran into a White Screen of Death (WSOD). Checking the logs pointed me to the Mollom error:
Class 'MollomDrupal' not found
It's tough to fix this as you might not be able to even log into the site to get to the admin page. Therefore, you will need to disable the module from the database.
Once you are able to log in, you should clear all caches from admin/config/development/performance.
If you have drush, you should be able to disable the module (might be unnecessary) and clear all caches from the CLI.
This fixed the problem for me.
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