When using the 3.3.1's default theme, Internet Explorer 8 does not display breadcrumbs. Other versions of Internet Explorer were not tested. We added the following to our Global Stylesheet configuration, which worked around the issue:

/* Hack around bug in 3.3.1: Breadcrumbs hidden in IE 8 */
#breadcrumbs

{ height:auto; }

This workaround overrides a style set in includes/css/master-ie-min.css:
#breadcrumbs

{height:1%;overflow:auto;*overflow:visible;}