I have an MSM installation with two sites (EE version 2.5.5, Playa version 4.4.5). I am using Playa on Site 2. When I am logged into the CP from the URL of Site 2 (i.e. http://site2.com/admin.php), my live filters for Playa fields work as expected. However, when I am logged into the CP from Site 1's URL (i.e. http://site1.com/admin.php) and am working in the Site 2, the Playa fields don't filter properly.
Here's what I'm doing: from the channel entry form, in my Playa field, I click the plus button on the Droppanes search menu to filter by Category. However, as soon as I choose the "Category" filter option (or any other filter option), all my listed entries are grayed out, and the filter doesn't seem to limit the entries.
I read on this question (Playa Filters failing with Force SSL module in place) that filters work with an AJAX call based on your URL. I also read that you can direct Playa to the proper site index using this line in the config:
$config['playa_site_index'] = "https://example.com/index.php";
I added this line to my Site 1 config and pointed it at Site 2's URL:
$config['playa_site_index'] = "http://site2.com/index.php";
Reset my browser cache, logged back in, but still not working. Any suggestions?