In the latest version (since 2.7.0 Beta 1 released in the blog post) when Spark user receives a reply, in chat window it shows "user has stopped typing" and this line stays unchanged whether that users is typing or not. Also, it really looks ugly.
Another issue is that it now doesn't show typing icon in the tab or in the systray (depending on the options).
Review this on trunk.
Other than still being an ugly text, it now works fine