>Unrelated to the 'Friends of Hue' program, the changes we made in 1.11 to our implementation of scenes exposed a compatibility issue with a limited number of 3rd party lights which stop them properly responding to scenes created in the Philips Hue app.
>Philips will not fix this issue as it relates to the implementation of standard ZigBee scenes functionality in the light and would expect this software to be changed in the light as part of 'Friends of Hue' certification process. This is an example of precisely the reason we have taken these steps.
TL;DR: Only "Friends of Hue" lights are guaranteed to be compatible.
Yes, as of the changes they just made and disabled all third party lights. Prior to this update there was no 'Friends of Hue' program and third party lights worked. It's a bit disingenuous to act like this was an established program that people knew about prior to intentionally breaking systems that were previously working.
TL;DR: Only "Friends of Hue" lights are guaranteed to be compatible.