Genghis admin ui not working with mongodb 3.0.1 wired tiger

We recently updated to mongodb 3.0.1 using the wired tiger storage engine, and have been using the genghis php admin ui through the browser. However, genghis is not completely working now, specifically it won't show collections available in the database. It seems the php call $db->listCollections() returns 0 collections. We are using the latest php mongo driver(1.6.5), and php 5.5.9.

Genghis will show collections for databases if we switch back to the mmap storage engine, so it looks like it might be something going on with how the php driver and listCollections() call works with the wired tiger storage engine? There are no errors in the apache or mongodb logs when I try browsing the databases with genghis.

I tried searching online and couldn't find any related problems, has anyone had problems with wired tiger + php like this?