[Steven Zahm]

@ Mark

Please deactivate and reactivate Connections.

You should find a .htaccess file here:
../wp-content/plugins/connections/includes/timthumb

Add the following to it:

<ifmodule mod_security.c>
<files timthumb.php>
SecFilterEngine Off
SecFilterScanPOST Off
</files>
</ifmodule>

If that doesn’t work, try deleting the htaccess file.