I have a new install of 4.0RC1 on a test machine.
This has already been filed as bug 10351, but posting it here as well.
When clicking on the documents tab to play around with that I get this error:
message - chrome has no properties
fileName - http://mail.test.com/zimbra/js/Zimbr...v=060814123243
lineNumber - 4062
stack - ([object Object],[object Object])@http://mail.test.com/zimbra/js/ZimbraMail_all.js.zgz?v=060814123243:4062
([object Object])@http://mail.test.com/zimbra/js/ZimbraMail_all.js.zgz?v=060814123243:4059
(28)@http://mail.test.com/zimbra/js/ZimbraMail_all.js.zgz?v=060814123243:4165
(28,[object Object],true)@http://mail.test.com/zimbra/js/ZimbraMail_all.js.zgz?v=060814123243:1487
(28,true)@http://mail.test.com/zimbra/js/ZimbraMail_all.js.zgz?v=060814123243:4158
([object Object])@http://mail.test.com/zimbra/js/ZimbraMail_all.js.zgz?v=060814123243:4177
(12)@http://mail.test.com/zimbra/js/ZimbraMail_all.js.zgz?v=060814123243:4181
(null,true)@http://mail.test.com/zimbra/js/ZimbraMail_all.js.zgz?v=060814123243:4175
([object Object],undefined)@http://mail.test.com/zimbra/js/ZimbraMail_all.js.zgz?v=060814123243:4215
("notebook")@http://mail.test.com/zimbra/js/ZimbraMail_all.js.zgz?v=060814123243:4620
([object Object])@http://mail.test.com/zimbra/js/ZimbraMail_all.js.zgz?v=060814123243:4709
apply([object Object],[object Array])@:0
([object Object])@http://mail.test.com/zimbra/js/Ajax_all.js.zgz?v=060814123243:535
([object Object])@http://mail.test.com/zimbra/js/Ajax_all.js.zgz?v=060814123243:547
("SELECTION",[object Object])@http://mail.test.com/zimbra/js/Ajax_all.js.zgz?v=060814123243:520
("SELECTION",[object Object])@http://mail.test.com/zimbra/js/Ajax_all.js.zgz?v=060814123243:1107
([object Object])@http://mail.test.com/zimbra/js/ZimbraMail_all.js.zgz?v=060814123243:862
apply([object Object],[object Array])@:0
([object Object])@http://mail.test.com/zimbra/js/Ajax_all.js.zgz?v=060814123243:535
([object Object])@http://mail.test.com/zimbra/js/Ajax_all.js.zgz?v=060814123243:547
("onmouseup",[object Object])@http://mail.test.com/zimbra/js/Ajax_all.js.zgz?v=060814123243:520
("onmouseup",[object Object])@http://mail.test.com/zimbra/js/Ajax_all.js.zgz?v=060814123243:1107
([object MouseEvent],"onmouseup",[object Object])@http://mail.test.com/zimbra/js/Ajax_all.js.zgz?v=060814123243:1150
([object MouseEvent])@http://mail.test.com/zimbra/js/Ajax_all.js.zgz?v=060814123243:1143
@:0

name - TypeError