I absolutely love this plugin!
I just installed v2.4.0 on a site, and a small issue is that the Google +1 box is slightly overlapping the Tweet button above it (left-side display).
It's not a big deal, but it is reproducible on the site using Chrome, Firefox, and IE. Example can be seen here:
I have version 2.3.0 running on another site, and it doesn't have this overlap. That could be purely coincidental though.