A month ago, I experiment some bugs on fireworks. There are shapes, that dissapear, or group elements thah disappear and when you try to select his layer, the shape appears in another coordiantes, and it's impossible to select. Mask boxes change you height by 1px and it's impossible to modify. The rounded shapes are deformed, like someone move the paths to the right.
I have a lot of desings mades with fireworks, and many files become corrupt, with this case of bugs that I've mentioned at the beginning.
A friend that also have fireworks has proved the same file, and it is perfect, but if I open the file, happens all this thing that explain on top.