I've been struggling with this for 2 days now. I reinstalled radiant (which works fine) and radiant-forms-extensions. Then I ran rake db:migrate rake db:migrate:extensions rake radiant:extensions:forms:migrate (which complained " Don't know how to build task 'radiant:extensions:forms:migrate') rake radiant:extensions:forms:update (which complained "Don't know how to build task 'radiant:extensions:forms:update')
Stopped and started radiant; still no "Forms" tab appears. I've just tried so many things, googled lots of error log messages, geez. Meta-problem: why the heck doesn't it JUST WORK? (Sorry, just have to vent a little.) So last resort before giving up. Any advice please?