We want to post and keep updated a list of known plugin and theme conflicts. If you have these plugins installed and are having issues, these may be the cause, so try deactivating them and see if that resolves the issue for now.
If you are aware of a plugin conflict or have details on the ones below, please add any details.
Note that if you are having major issues with 2.0, you can safely rollback to 1.9.13:
BBPRESS. Can cause site crash. Triggers error that looks like: Fatal error: Call to a member function get() on a non-object in /home/content/deletedactualpath/wordpress/wp-includes/query.php on line 27
MAGIC FIELDS PLUGIN. Can cause site crash. Triggers error that looks like: Fatal error: Call to a member function get() on a non-object in /web/content/wp-includes/query.php on line 27
SOLILOQUY SLIDER PLUGIN. This may cause aspects of our interface to disappear, especially when adding galleries to pages/posts via the new Attach to Post interface.
CONTACT FORM 7. Still trying to determine the effects on this one. I think I've seen one example where it seemed to trigger major errors, and another where it just interfered with gallery displays.