CKEDITOR did not show up in product page in admin

I used Tinymce editor for zc 1.39 and worked great. Recently, upgrade the zc to v1.51. Then Tinymce stop working ( more specific can not save ).

I read the forum and decided to try CKEDITOR. I chose this editor as html editor in admin-configuration-my store. It showed up in categories page and defined pages editor, but not in product page. No matter what I chose in categories-products page, it always show the plain text in product page. However, if I chose tinymce( although it does not work) in categories-products page, tinymce editor can be showed up.

Did I miss something here?

Also, the color of CKEDITOR icon is grey instead of multicolor as someone else showed in the forum. Is that right?

The color of CK editor changing is pretty normal however do a quick file comparison of the ADMIN folder of the new and old versions of the files there is an extra file in the 1.3.9 version versus the 1.5.x series as it is no longer needed, once I remove that file it usually starts working for me.

Problem solved. My admin old product.php has some problem. The editor showed up when I replace this old product.php with the new product.php from zc1.51. Thank you, everyone, for helping me!

Further investigation by comparing these two files showed that the original problem was caused by javascript conflict.