Hey guys, just in case any of you are still having issues or if someone else comes across this post -- I was experiencing the same thing, it ends up that having Spotify running in the background was the cause of my problems -- you can see more here: Re: Fireworks CS6 from CC doens't respond properly anymore…
If it's not Spotify you may have to delete the Fireworks preferences file.
First you will have to make sure your Library folder is viewable and you are accessing the root folder on your hard drive. In recent releases of Mac OS, it is hidden by default.
First, show your Hard Drive by following these directions:
- In the Finder, choose Preferences from the Finder menu.
- Click the General icon on the toolbar.
- Select "Hard disks" in the "Show these items on the desktop:" section.
- Close the Finder Preferences window.
Next, you'll have to unhide the library folder by following these instructions:
In the Finder, choose View > Show View Options (or press Command-J).
Near the bottom of the resulting View-Options palette is a setting called Show Library Folder. Enable this option. Your Library folder is immediately visible.
In that folder, find the Preferences folder. Then in the preferences folder, find the file with this name (or similar): "com.adobe.Fireworks.12.0.0.plist" and delete it.
Restart your machine and Fireworks and your problem may be solved.