Ran into a bit of a problem with the anthology feature in a particular series:
https://www.tthfanfic.org/Series-42
Basically, the description page is exceptionally long and exceeded the room in the FFF window. The problem is that instead of turning into a scrollable window, apparently the windows just expanded downwards offscreen, taking the controls with it into unavailable-land. I tried expanding the window sideways in hope of reaching the end, but it wasn't enough.
Fortunately when I hit <Enter> blind, FFF went ahead and processed the series.
It's not a dealbreaker issue, but it's a bit annoying.