Two possible solutions for you:
If you're running Chrome, enable Pepper Flash and completely clear out your cache, restart the computer and try again.
**Remember to always enable cookies.
If that doesn't help, you may need to try uninstalling, then reinstalling Flash. Sometimes a bad download causes strange hiccups.
Let us know if this helps.
Follow my story prompt project: The Bestiary on FA. Now on SoFurry! Mystical creatures, furries, and occasional sex. ^^
Or read my latest erotica novella All in the Mind on FA or SoFurry!