I've had great luck with this extension and love it but I did run into problems with Joomla 1.6 and 1.7. RokCandy just didn't work - it didn't render out correctly and gave gibberish. I found out if I went to Article Manager > Options > Text Filters and set my filter group to "No Filtering" it fixed the problem with RocCandy. I had tried fixing it in my editor config (JCE) by preventing stripping of code but that didn't work. Hope this helps because it's a great extension!