by Sarthak Singhal
I have seen that users of Fireworks are running into issues where the design job is lost while saving the file. I admit to this begin a huge frustration for the users and we will work on to better it. Till that time a useful utility is present at the following web address which can save the png file automatically for you.
Further details of the extension can be obtained from the first link. Any other doubts or queries post them right away.