Thank you for taking the time to reach out to us and reporting this major issue. We have just pushed out a patch to resolve it and everything is working perfectly again!
If you see anything else strange, or would like to see any new features in a future release, please do not hesitate to reach out to us again!
If you feel that our plugin is useful, we ask that you take a moment to give us a 5 star review here: https://wordpress.org/support/view/plugin-reviews/wp-facebook-pixel#postform. If you do not feel we deserve 5 stars yet, please let us know what we can do to earn all 5 stars before submitting a review.
Truly sorry for any inconvenience,