Facebook error: "Your video could not be processed. Visit the video help page to learn about common problems."

I've successfully authorized flixel for FB, but when I try to share a flixel to FB from within the iOS app, I get this error:

"Your video could not be processed. Visit the video help page to learn about common problems." 

That link, of course, leads to a simple, generic, i.e., useless, reference page.

Does anyone have suggestions on how to fix this issue?

FWIW, I've not modified the flixel in any way, and have only tried sharing it directly from the app via iOS5 on an iPhone 5.  Wondering if it's a problem with FB's latest timeline changes, ... thanks!