A small issue with Google Docs

Here's something interesting that happened to me last week. A friend of mine has shared with me a folder from his Google Docs. Like with other shared folder, I was supposed to see it under "folders shared with me", but I didn't. Instead, it showed me a "No folders shared with you" message and when we both edited a doc, we saw one another as "anonymousXXXX".

So from where does the problem coming from, and how to solve it? Simple. Apparently, he shared the folder with a Google Group which I'm a member in, and not directly with me, and Google Docs doesn't make the connection. The solution is simple - have people shared folders directly with you.