I have a problem with the filter, Unfortunately does not display the list of tags and / or categories, the button does absolutely nothing to click, I do not know what could be the problem. I'm using the "Davies" setting.
I already tried different web browsers (Google Chrome, Mozilla Firefox, Opera).
Attached image and link to the website I am currently working on.
After reading a lot I could not get information about it, then I test manually the files and after many tests I realized that my problem was a file (.js) of the "Flex template" called "bootstrap.min.js", when I deactivated this file the filter could work correctly.
Yes, TZ Portfolio load bootstrap library itself. So if you template using Bootstrap JS, you can disable bootstrap of TZ Portfolio.
Go to Administrator -> Configuration -> Advanced Tab -> Disable Bootstrap library.
I am happy to see you solve problem by yourself. Don't hesitate contact us if you need further assistant.