You say Outline view, but what happens with preview turned on?
What is the actual (point) size of your type?
Why do you need to work in Outline mode?
I can only get greeking to happen in very small screen sizes (and only in Outline view).
The used to be a preference setting for greeking but I think it has been done away with.
Maybe a restart might help or even a reboot?
No greeking in Preview Mode.
Not sure what the point size was.
I need to work in Outlines Mode because it provides me visual information I can't get in Preview Mode. I know you know what I'm talking about.
But I'm just writing this off as a fluke. It stopped doing it, after I restarted Illy I think.