The text of the field is now shown / editable when the ckeditor field is in a vertical tab on chrome(i think its an rtl/he prob)

I'm running the latest drupal 7 site.
The problem started from ckeditor 4.0, now i'm on 4.1.2
I've tried the latest ckeditor dev module also

*** In the print screen below, the skin is kama even though its ckeditor 4.1.2

The problem is that when the ckeditor textfield is inside a vertical tab(field group module) on my HE site, the text is not shown when i toggle to the the tab nor the textarea is editable until i reload the page or touch the "source" button.

It doesn't matter which text format i'm at(as long as it support ckeditor).

The problem occurs only on chrome and when i put a default language of HE(if i toggle it to EN there is no problem)

I've added a print screen so people can understand my problem better
10x!