When a RadButton with configured ValidationGroup is used on a master page its server-side event 'Click' is not raised in: -Internet Explorer and Chrome, but FireFox and Opera. -In all browsers when the master page contains a RadAjaxManager.
I am finding the server side click event does not happen when there is ValidationGroup OR OnClientClicked used OR OnClientClicking used. No errors are given and a postback will occur, but the event does not fire. As a test I was able to simply switching button to a ButtonTYpe="LinkButton" will cause it to work as expected.