Just to add a bit, I just ran the plugin check and I also get the error
"Missing the call to wp_head() in your theme, contact the theme author"
However, I know and double and triple checked. I do call the wp_head(). However, it seems that if you use a minify plugin which strips comments then this error might show anyway. I am not sure that is the problem Ballet news have.
@Ballet news, I have no clue why you must update as soon as it says there is a new version. That is certainly not the case in a healthy wordpress install, and you should certainly look into this issue.
And to be honest you make your self look like a fool right now, by issuing this behaviour. Alex has been very nice to put his source code out for everyone to use. However, he does not have access to test every combination of browser/plugins/themes. Therefore this happens from time to time. If there are bug in your combination, you have three options: 1) wait for him to have time 2) Pay him to fix it 3) Fix it your self.
@inniskr I get the same problem in IE8 and can fix it by the same fix you suggested.