I can confirm that this issue is present in Chrome (ver. 25.0.1364.152 m). I also found that files (Startup2_all.js.zgz and NewWindow_all.js.zgz) that were affected (bug 58569) in Zimbra 8.0.2 FOSS 64bit contains fix for mentioned bug. So it means that this is something different - maybe in Zimbra 8 other files are responsible for that function? I will reopen (if possible) this bug with link to this post.
Please, do something quickly. The problem is very annoying, cant work on a different browser than Chrome.
On Mac OS X Mountain Lion and latest Chome no such issue - this seems to be a Chrome Windows version bug. This is probably because of cmd / ctrl keys difference in Apple hardware family.