I recently updated a site to EE v2.7 and also updated all of my third-party add-ons to the most recent versions. The site in question has several channels, and everything seems to be working fine until I try and publish/edit something in a channel that doesn't have a "Matrix" fieldtype associated with it.
Little to none of the JS seems to be working on the publish/edit form (e.g., the "Entry Date" calendar widget), and even odder, the contents of EE's file upload modal appear at the bottom of the screen -- even though the channel in question doesn't have a "File" fieldtype.
I've tried reinstalling Matrix files, clearing caches -- the usual thing. Any ideas?