I looks like the issue is needing to remove GL_AMD_debug_output since it doesn’t work with the PowerVR driver on Intel-based devices properly.
This did not make it in for 4.9 but will for 4.9.1 hotfix. You can get the proper fix from this GitHub commit:
[link text][1]
https://github.com/EpicGames/UnrealEngine/commit/b70026cc89f897c7e141f7a15f34f4eefe17886a