Can't Comment From iPad

Okay, I don't know if this is just me, but for some reason I can no longer reply to people's comments from my iPad. Tapping the reply button in the comments section does nothing. I have a 3rd gen iPad running iOS 6. Is anyone else bumping into this problem?

EDIT: I should note that the problem is intermittent, not constant. Sometimes it works, other times it doesn't. I haven't figured out a pattern yet, but I'm just curious as to whether anyone else has bumped into this at least once. If so, I'll know I'm not alone. Otherwise, I'll blame myself.