Scroll to the bottom. There's an error message there -- it's easy to miss, as it's black on black.
Highlight it and you'll see: "Error running style: Died in S2::run_code running FriendsPage::print(): Can't use string ("") as a subroutine ref while "strict refs" in use at (eval 382) line 177."
I was getting the same error with my custom variant of Generator, so I switched to vanilla Generator to see if it would do the same thing, and it does.
Also tried it on the "Clean and Simple" style, with the following error: "Error running style: Died in S2::run_code running FriendsPage::print(): Method called on null CommentInfo object at layer #8, line 540."
It seems to be a problem with the specific entry on my friends list, with some null values in it.
Shouldn't S2 be more capable of handling unusual values? Should I zilla this?