I reported it in the bug tracker for jQuery UI, but it might be a bug in jQuery itself, so reporting here as well.

Bug report: https://bugs.jqueryui.com/ticket/14900

Summary: In IE 8 through 11, the placement of tooltips are wrong in 1.12.0, while they were correct in 1.11.3.

1.11.3:

1.12.0:

JSBin: www.jsbin.com/menoxo

EDIT: Just tested in IE11 with the new 2.2.0 release of jQuery. Same error there