Hello. I tested CComment Pro (git_aefca8b) in Joomla! 3.4.1, VirtueMart 3.0.8 but the form of comments does not appear on the product page. In Joomla materials - yes.
I have created a configuration for VirtueMart, tried different Joomla templates, tried to disable various system plugins. Nothing helps.
On the local server I installed a clean Joomla! 3.4.1, VirtueMart 3.0.8? templates - by default. Nothing changed, but CComment Pro (git_aefca8b) still is not working.

We have discussed this issue here. At that time, everything worked.

I would be glad if you could help. I can grant access to the test site.