Still working for me. I can update all three worlds (Normal, Experimental, and Other Areas), and I can do so regardless of whether I choose the regular executable or the "V-Sync" one.
Here's pretty much what you should see when you get it to work for the first time:Connecting...
Server: Hi ho!
Generating download list...
Generated!
--- x1000y1000 ---
The file already exists! Comparing sizes...
The file is identical. Skipping!
--- x1000y1001 ---
Beginning file transfer...
Download complete! Validating...
File passed validation! Added to Normal world!
--- x1000y1002 ---
Beginning file transfer...
Download complete! Validating...
File passed validation! Added to Normal world!
(et cetera for all other areas)
My best guess as to why it's not working for you would be that maybe you have a different version... Compare this image to your main menu. Check the build number as well as the text in the lower right.