Upvotes & Downvotes no longer being stored

Looking at the liked/disliked section of my profile, there is a flat cut-off about 2.5 months ago - upvotes and downvotes before this time show up fine, but nothing newer shows up. It seems like my votes aren't counting at all.

Anything I just voted for in my current session shows up, but vanishes shortly thereafter (not sure if it goes away when I close my browser, a certain amount of time has elapsed, or if there is some other trigger). I'm using Chrome on Windows 7.

This appears to be a different issue than this one: http://www.reddit.com/r/help/faq/#Mylikedhistorykeepsdisappearingmyupvotedlinksarentshowing, but it could be related.