We will be shipping a hotfix for this as soon as possible.
This is a compatibility issue with PHP 5.2. While we do try to support old versions of PHP 5.2, because WordPress itself does, using out-of-date versions of software like this is bad for security and site performance.
You have two options for a temporary fix:
Thank you so much for your patience! Please let us know if you have further questions on this matter or anything else we can try to help with.