pfSense

Hello all,
I am using pfSense 2.0 RC1 build on Thu Mar 10 20:40:57 EST 2011. (AMD64)

There is a strange behaviour of the captive portal while using IE8.
If I put in the voucher code and press the Enter key the page reloads and the voucher input box is blank again but nothing else happens.
I have to put in the voucher and then click the proceed button with the mouse to get it to work.

Thats the code I am using:
<form method="post" action="$PORTAL_ACTION$">
<input name="auth_voucher" type="text">
<input name="redirurl" type="hidden" value="$PORTAL_REDIRURL$">
<input name="accept" type="submit" value="Proceed">
</form>

If I am trying this with Opera or Firefox the Enter key is working as it should.

Maybe the following information helps to solve the bug:
If the fields username and password are not removed from the code above the Enter key is also working with IE8. (But I want to remove them because I only want to use vouchers.)

Thanks in advance,
Karsten