we are using "Release 7.1.3_GA_3346.UBUNTU10_64 UBUNTU10_64 NETWORK edition" and I have a problem displaying html-mails.

When I recieve a mail in html format, the webclient does not display the scrollbars. More over, the height for the content is very low and the height would not be resize when showing the mail in a separate window.

I have the same problem when using the zimbra desktop (7.1.2) on different operating systems.
The problem exists on win xp (32-bits), win7 (64-bit), ubuntu 11.10 (32-bit) but not on ubuntu 11.04 (64-bit).

How could this problem be solved?