Just to let you know what we did for compatibility with WordPress 4.4.1. This week (after 4.4.1 RC) we ran a subset of our QA on WordPress 4.4.1 RC. The full QA doesn’t fit in 2 days. We manually reviewed the code changes going from WordPress 4.4 to 4.4.1. Then, we updated our own sites to WordPress 4.4.1. It’s all good.
If you’re upgrading WordPress to 4.4.1 and are getting problems that you didn’t have before, please let us know.