Netscape 6 issues

I am encountering the following problems with Netscape 6 which I do not get in Netscape 4.7 or IE 5.0/5.5.

1) Alignment is off in most of the pages.
2) The details provided during User Registration page are not backfilled in Change Profile page.
3) A page is not getting refreshed if we select an option in the drop down list. Actually, it is supposed to be refreshed so that another drop down list has the corresponding value.
Would also request if you could direct me to resources in the netcovering these issues.