Hmm. Had a problem with wp-grins lite with 3.3, and as that hasn't been updated in a while, I thought I'd try this one.
Main problem is that the smilies don't show up in the back end. Works fine on the comment form, however.
(The problem with wp-grins lite is that the smilies are visible but clicking them has no effect - presumably the JS isn't being triggered somehow)
To eliminate plugin/theme/oddness issues, I've spun up a test site with no additional plugins installed, with the same result.
Any suggestions would be appreciated.
 Given the time of year, some time in 2012 will be fine :)