Since upgrading to Confluence 5.1.3, we haven't been able to get community bubbles to work. The commands to change a space into a community are there, but even after doing that, the forum macro doesn't appear in the macro browser, and putting it in via wiki markup gives a "macro not found" message.
The license is still there. I tried uninstalling and re-installing, with no result.
In fumbling around the the web, I ran across that something called "Community Forums" is a paid Adaptavist product. Has Bubbles been replaced by that, so it no longer works? It would be nice if there were something on the Adaptavist site or the Atlassian plugins site that said that if it is true.