True, the conversion factor was not applied to the fluid weights in the initial release of Version 3.00. This problem was corrected in the 080201 (Feb 1, 2008) build.
Assuming you registered your software, you would have received an e-mail from COADE announcing the availability of this "build", and directing you to download it from the website. This is the main reason we suggest that everyone register their software.
Subsquently you should have also received e-mails announcing the release of Version 3.10 and Version 3.20. The API-650 Code has changed significantly since the release of of TANK Version 3.00, you really should be using Version 3.20.
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Regards,
Richard Ay - Consultant