Have you installed the latest updater: (not sure if that will solve the problem, but worth a try).
Once updated, go to Help > About and confirm that Fw is now version 10.0.3.011.
and / or try:
Resetting FWs preferences:
Browse to the Preference file location, as per your OS.
Windows [Drive]:\Documents and Settings\[UserName]\Application Data\Adobe\Fireworks CS#\English\
Mac [User]/Library/Preferences/Adobe Fireworks CS#/en/Fireworks Preferences
Delete the Fireworks CS# Preferences.txt file associated with your current FW version.
The next time Fireworks is launched, a new preferences file will be created that restores Fireworks to its original configuration.
Thanks, I will try that when I get home and let you know if that works.
Worked well thanks!