When I first upgraded to CKEditor 4.1.2, IE 10 did not work when I hosted on my local machine, but in Chrome. I only got a black rectangle where CKEditor was supposed to be. After lots of trial I found out that I can make also IE 10 work by using this line:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
But when I uploaded the ASP.NET website to the hoster, only Chrome worked properly. The CKEditor functionality worked in IE 10, but no Icons where displayed. I could not see the buttons, but click on them and they worked. When I analised what the IE is downloading, I found only this strange case:
From local host (meaning everything works):
/ckeditor/skins/moono/icons.png GET 200 image/png 26.30 KB 0.53 s background-image 4836 0 281 249 0 1061
From hosted website (IE not displaying icons):
ckeditor/skins/moono/icons.png GET 304 application/octet-stream 147 B < 1 ms background-image 530 0 0 0 0 1575574
Any idea what could be the problem ?
I faced this problem for more than 1 week, during which I restarted my PC, etc. I also had it today, but when I played with the IE developer tools to investigate the data exchange between browser and server, the problem disappeared after 1 hour, without me changing anything on the server, even not clearing the browser cach.