I'm studying a chapter from Integrated Chinese at the moment (just one chapter) on ipad in the advanced study mode as I want to focus on a few tricky characters from this particular chapter. After about 5 or 10 characters it won't go onto the next one despite their being about 30 characters altogether. I can go back to the previous one alright. What gives?

It's saying there are no words due but every few seconds I hear the sound for a new character added but the word count still remains at zero.

This is a bug in single-list study that is fixed in 2.1.0, which we'll be sending out soon. It doesn't recognize the added words from that list until the next session.

No problem. Cheers.

Yours sounds like a general internet connection problem, malaili. All of the symptoms you were describing are things we've occasionally seen in the past when the connection to the Skritter servers is poor.

Because part of the info for that word was downloaded incorrectly, and the client can't handle the corruption, so it errors out when it comes to that one. You can try totally clearing your cache when that happens, although it can be hard to make sure that the cache (including the Flash cache) is wiped.