I think the function _checkOffset is failing, in all browsers.
Whenever open a datepicker when my browser window is scrolled down and/
or right, it draws the datepicker too high and/or left, often I have
to scroll to find it. I checked this with svn checkout and it still
fails, even with the packaged demo.
Opened a ticked for this yesterday (#3863). Anybody not have this
problem, or aware of it already?