i had the same problem..found answers by searching on google..
try add this to ur default.css file :
textarea {
overflow: hidden;
display:block;
}
worked for me
leme know if it works
awesome that fixed it! Thanks so much!
no problem, glad to help out 
Ok I thought this was fixed. Now when typing in the box and you go past what you can see it does not put the scroll bars in place and you cannot see what your typing. I am assuming because of the overflow:hidden
Have you seen this with yours?
adam
yes it is because of the overflow:hidden, sorry i overlooked this as i am using a jquery plugin to autogrow the textarea as u type into it.. remove the overflow and style the:
form#whats-new-form #whats-new-textarea {
-moz-border-radius:3px 3px 3px 3px;
background:none repeat scroll 0 0 #FFFFFF;
border:1px inset #CCCCCC;
margin-bottom:10px;
padding:8px;
}
form#whats-new-form textarea {
border:medium none;
color:#555555;
font-family:inherit;
font-size:14px;
height:60px;
margin:0;
padding:0;
width:100%;
}
this is what testbp.org has
or simply get firebug addon and use with firefox
ok thanks that seemed to have fix it now! I will let you know. 
Thanks so much.
