the ability to open an application is not indicative that it's "working perfectly well."
You misunderstand, we are discussing in this thread, the ability of Keynote to open existing versions of Keynote files:
"my clients on 6.5.3 can't open any of my files"
Let me know when you can export slides to JPEG at full resolution in Keynote 6.6 . You'll find that this feature is broken and you won't be able to do it.
Happy to do this after Apple issue an update that fixes this. At the point of making my last post I was unaware of this issue, from other posts I have found this to be a current problem with version 6.6, one of the reasons the community is effective at keeping us informed, as Apple appear not to do so.
I'd probably back off being a bit pompous and self congratulatory that your setup is working so well
I do not intend to modify any post that I make that is within the terms and condition of the community and that is made in good faith merely because a single poster does not understand the concept of personal evidence. If you are offended by any post in the community, you can submit a report post request to Apple.
it appears you are an extremely basic user of the application.
There is no restriction on whether a user has used Keynote for 5 minutes or 5 years, when making submissions to the discussion, all users are welcome to give constructive help in the discussion community.