Cannot see anything in the Preview field which is a new bug description on FreeBSD Bugzilla

[WATANABE Kazuhiro]

Hi.

I have tried to write a new bug report on FreeBSD Bugzilla.    
 
I can write a description in the "Comment" field, but cannot see
anything in the "Preview" field before clicking the "Submit Bug"
button.  In the "Preview" field:

 Firefox: show nothing.
 IE: show a string "null".

But when I write an additional comment for a existing bug report, the
"Preview" field shows a sentence properly.
   
Does anyone occur the similar problem?
---
WATANABE Kazuhiro (CQG00620 at nifty.ne.jp)