I usually install one extension at a time to make sure everything is working as expected. Since you have already installed all of the extensions, all you have to do is make sure that the cache has been updated after the last extension you installed.
It only takes a second to make sure that the cache isn't causing any problems before you start troubleshooting. I have a shortcut on my desktop to the folder so it can be deleted easily.
There's more info in the link.