I mostly use the web-based version, so memory leaks aren't really an issue. On what platform did you have problems? (I also have the android app, but don't use it much)
See here and here. I used the web version, which was extremely buggy. From your comments I assume it might not be that terrible anymore, so I'll look at using it again.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.