As many of you have noticed, 2.1.1 shipped with a small bug that is preventing some popular third party add-ons from saving their data on the publish page. Yesterday, we boiled the issue down to a single line of code in our Channel Entries API that was meant to patch up a regression in our autosave code.
In the last 24 hours we’ve been trying to come up with an alternative patch for the autosave bug. Unfortunately the solutions so far involve substantial modifications to our code.