Using it here on 1.6.1 with a whole bunch of other extensions and modules and works fine. There must be something conflicting with it. Also make sure that you have the latest version as I seem to remember there were quite a few changes to the extension. Not sure if the attachment at the top of the post is the latest one or not.

Hope that helps.

Best wishes,

Mark

There’s a bug in the version posted here, the extension does not check for other calls by other extensions when adding the javascript to the publish page headers.

should be (around line 55)

Without this, Playa extension does not work for example.

Thanks peschehimself. I’ve made the update.
Check the first post and get latest version of extension.