zimbra 8.0.6 and print action problem

Hi, i've installed zimbra Zimbra 8.0.6_GA_5922 (build 20131203103702). I've a problem with print function in web mail client.
If a user receive an html mail and press the p button the print preview is correct and show images.
If a user click two times on a mail and after press p or action print the print preview show html tag and strange character, missing date and mail sender address.
So i've noticed in debug mode that when a print is correct the link is:

100.0.0.197/h/printmessage?id=281&tz=Europe/Berlin&xim=1

instead when the print is incorrect the link is:

100.0.0.197h/printmessage?id=281&part=1&tz=Europe/Berlin&xim=1

The difference is part=1. If i removed this the print preview is correct.

I've tested it with iexplorer 11, firefox 27.0.1 and chrome 33.0.1750.117 m, in normal pc and terminal server but nothing change.

So how i can resolve this problem?