Problem with Quick Cache (pro)

Hello, I’ve got some problem with the combination of Ajaxed Comments and http://wordpress.org/plugins/quick-cache/ -I use the Pro Version and did not test with Lite version but I suppose it’s the same.
In some circonstances, visitors cannot post comments if the two plugins are activated together. There is no problem for me to post comments as Admin.
I contacted Quick Cache authors here
https://github.com/WebSharks/Quick-Cache/issues/59
and I don’t know if the problem is general with cache plugins.

http://wordpress.org/plugins/ajaxed-comments/