When you try to start Fireworks CS4, you receive the error, "Could not launch Fireworks. An internal error occurred."
Do one of more of the following:
Solution 1: Validate fonts (Mac OS).
Fireworks doesn't launch when it encounters damaged fonts. Fonts can become damaged when modified with font editing applications. For example, if you used a font editing application such as CrossFont to convert a Mac OS font Helvetica.dfont to a TrueType font, such fonts in your system could be reported as damaged. Similarly, if any fonts have duplicate PostScript names, Fireworks doesn't launch.