IE8 collapse toolbar issue

I am running CKEditor 3.1.0, revision 4885. Under IE8, the collapse toolbar button is not working. It will work if I put IE8 into "Compatibility View" but I was wondering if anyone has found another work around for this issue?

My configuration file is pretty simple:

CKEDITOR.editorConfig = function(config) {
config.toolbar = 'CustomToolbar';
config.toolbar_CustomToolbar =
[
['PasteText', '-', 'SpellChecker'],
['Undo', 'Redo', '-', 'Find', 'Replace', '-', 'SelectAll', 'RemoveFormat', 'HorizontalRule'],
['Format', 'Bold', 'Italic'],
['-', 'JustifyLeft', 'JustifyCenter', 'JustifyRight'],
['NumberedList', 'BulletedList', '-', 'Outdent', 'Indent', 'Blockquote'],
['Link', 'Unlink'], ['Source']
];

config.removePlugins = "elementspath";
config.height = "440";
config.dialog_backgroundCoverColor = "#000000";
config.enterMode = CKEDITOR.ENTER_BR;
config.forcePasteAsPlainText = true;
config.pasteFromWordRemoveStyle = true;
};

Thank you.
- Bradley