The new player in SCORM has some IE 7 issues:

on first load of the player the contents of a SCORM package don't display, but if you resize the full IE browser by maximising/changing size the contents "magically" appear!

when the TOC is hidden by default:
JS issue
Line 2649
"Can't move focus to the control because it is invisible, not enabled, or of a type that does not accept focus"

coming from theme/yui_combo.php
focus: function () {
on the line:
aEl.focus();