After updating to 1.2 I get a bunch of PHP warnings on my page.

Edit the functions/shortcodes/loops.php file and locate lines 136 and 381 which are both identical and should look like this:

if(!empty($disabled_filters)) $disabled_filters = explode(',',$disabled_filters);

Change them both to this:

$disabled_filters = !empty($disabled_filters) ? explode(',',$disabled_filters) : array();

Next, edit the functions/admin/option-generator.php file line 1783:

$builder_name = $builder_array[$builder_id];

Change it to this:

$builder_name = array_key_exists($builder_id, $builder_array) ? $builder_array[$builder_id] : '';

Both of these issues will be permanently fixed in version 1.3.