Refresh all your domains via Panel:
[color=#00CC00]Domains > Manage Domains > [/color][color=#0000CC]Edit[/color]
Click the [color=#0000CC]Change fully hosted setting now![/color] button.
For those sites using Gmail, switch them back to DreamHost Mail during the above updating procedure, wait 10 minutes, then repeat the process, switching back to Gmail again.
That should refresh everything on the backend.
With the WordPress problem, use phpMyAdmin to export a backup of your affected databases, backup your wp-config.php files and any custom images/content via ftp or shell and reinstall or upgrade WP 2.7.1
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How To Install PHP.INI / ionCube on DreamHost