Looks like IE7+IE8 have some problems.
SCRIPT87: Invalid argument.
mootools-core-1.3.2-full-nocompat.js, line 3565 character 3
Perhaps that's why rotate does not work and the help is not displayed
Does this error occur in normal viewing or only on the annotation example?
And rotation won't work in IE7/8 as they don't support CSS3 transforms. But does work in IE9+, Firefox, Chrome, Safari and Opera etc.
It happens in normal viewing. However...I tested it on 5 different boxes and only one of them showed the error. Perhaps we should ignore this phenomenen and if it reoccurs on other boxes I will get more detailed info.
OK, I'll close the bug for now.