The Python26\site-packages\matplotlib\_tri.pyd file in the FaceFX installers is being falsely identified as a threat by webroot.
Uploading the file to https://www.virustotal.com/ lists webroot as the only one out of 61 virus scanners to identify this file as a threat. We have opened a support ticket with webroot to resolve the issue.
The entire matplotlib folder can be safely deleted from your FaceFX installation folder if you would rather not have it there. The upcoming FaceFX 2017 release has already done this for reasons unrelated to this false positive.