I posted the issue for http://drupal.org/project/regcode here:
http://drupal.org/node/308123 .

I am sorry if it is not the correct way to post issues. As I am not sure whether I should seek help from the author of RegCode or Bio. I am posting it here also.

I installed RegCode module on Drupal 5.10 and it worked great. Then I installed Bio mdoule. Now RegCode does not work correctly. I disabled Bio. Regcode started to work properly. Is there any fix for it?