Having read 99 posts that experience the same issue: cannot select a tool in CS5 (crop tool) in my case, the fix is always other software that has been recently installed or updated. In my case, I had installed Plustek OpticPro A360 scanner software the day before. I uninstalled it, rebooted my PC (W10) and voila, Fireworks operates perfectly again. Moral of the story: think back to software you have recently added/updated. Have fun!
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