Did some testing of firefly and I don't see what it is that you are saying.  Of course all there is a statement that it does not work with no pictures or anything else to describe the issue.  As Rhia474 says submit a bug report and include the scene that is causing the issue.  Use the Export-> Save for sharing and select those items that are needed to create the problem.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13