Just looked at the site and there is no problem with the Hosting account. The Form page, for Login / Create Account, is working properly. The problem is the code used is not the default code nor usable code actually. Someone has changed things within the current Template files to make the Form for the above page, pretty much unusable.

Example

Current Template code:
<label class="inputLabel" for="firstname">First Name:</label>
<input type="text" name="firstname" size = "1" maxlength = "0" id="firstname" /><span class="alert">*</span><br class="clearBoth" />

Default code:
<label class="inputLabel" for="firstname">First Name:</label>
<input type="text" name="firstname" size = "33" maxlength = "32" id="firstname" /><span class="alert">*</span><br class="clearBoth" />

If you switch to the 'classic' Template you'll probably find everything works / displays as it should.