5.5.2 Look before you leap!

[CALL-151]

Don't ignore the fine print in the notes for the recently released 5.5.2.

From 5.5.2, the iOS engine's internal structure has been changed. Unfortunately this means that all existing externals written for that platform must be updated.

I know that at least some (hopefully all) externals are being revised to be compatible, but if you rely on an external make sure you have an updated version before you upgrade.