Does the OpenUI menu works fine in other browser like, IE10, Mozilla, the issue is only with Chrome?
Which Siebel application you have configure for OpenUI and what is the Siebel version?
We are experiencing the issue in Chrome browser only. Same functionality works fine in IE10, mozila.
We are using consumer goods siebel application (Version 188.8.131.52) and for it we have configured Open UI.
Does it happen when the chrome browser is maximized?
Do you have any additional toolbars or extensions installed on chrome? If yes check if disabling/uninstalling them make any difference.
Hope it helps,