Have you tried in scan database running the rebuild reviews option?
Allow rating is turned on right?
See this code is unmistakable in showproduct.php
Code:
Content visible to verified customers only.
http://www.reeftalk.com/reviews/show...p?product=1666
AGAIN with my testing I see no issues using default code and this function.
I would suggest you upload all clean non modified files to your site except the config files and run any missing upgrades.