I am the developer of this Droid Explorer which does show hidden files.
If you are talking about this Droid Explorer (by Asif Wani) then I can't help you, as I have nothing to do with that app. I would suggest you contact the developer of that app. His contact info is at the bottom of the link I posted.
I am going to assume you mean the App for Android Devices, not my application that runs on Windows...
In the settings of that application, there is the option:
Now, is your device rooted? Because you will not be able to see files in the
/data/data/ if you don't have root. Root requires more than just a "root enabled" file explorer. And it will show "empty folders" if you do not have access to view the files. This is the case with all file explorers, including the one that I am the developer for.