Have you tried re-installing Fireworks? Otherwise, I see not solution. Fireworks is no longer developed (since May 2013), so compatibility problems are to be expected at some point with newer versions of operating systems.
Thank you Herbert. I made the switch and purchased Affinity Designer. WOW!!!! Great sub for FW. It even has Illustrator features built in and it was only $39 one time.
I don't like working on anything that is not being made anymore. Thanks for clearing that up!!! :-)