I have the same issue on my recent iMac, but it's working fine on an older Macbook. Looks like there is a conflict with Spotify. Here is a thread with plenty of clues... Good luck https://forums.adobe.com/thread/1355773
Wish that were so. I saw those threads, but I don't use Spotify at all, so that's not it. I did try a number of ideas from there, such as removing the preferences files. Didn't work.
I solved the problem.
It cost me some money, but I updated my FontExplorerX software to the current version. Now the Fireworks text tool works reliably again.
I'm not sure why this was necessary, as the previous version of FontExplorerX was doing the job quite nicely, and Fireworks never had a problem with it before. But after uploading, the crashing issue stopped, so I guess the process of upgrading must have tweaked the right spot in my system to get FW to play nice again.
Just posting this here in case anyone else has encountered this problem.