A problem has been discovered in the cmdlineprocessor.exe of CSE HTML Validator Pro v8.00 BETA 2. This causes a problem ("Cannot load DLL") when validating from certain third party tools like HomeSite. This fix is not needed in versions above v8.00 BETA 2, such as BETA 2A.
If you have this problem, then please upgrade to the latest BETA (you should anyway).
Sorry for the trouble.