Text selection does not work with double click in CKEditor

Hi,

We are using ckeditor 3.6.3 version and we are experiencing a strange issue. When we double click on a word to select the word then it is not selecting that word. If i press and hold the mouse button and drag the mouse pointer from point A to B then the text is getting selected but that text selection is not happening on double click on a word. Any help in resolving this is appreciated.

We are using IE7, 8 & 9 and the problem exists in all these browsers.

We tried the below workaround but it has some other issues.
1) The html files in our applications do not use any doctype and we understand that CKEditor uses HTML5 by default. I tried changing the CKEditor's docType property to use HTML4.0 to work the quirks mode. Text selection on double click is working fine after changing this but I see that there is a known issue with using HTML4.0 (http://dev.ckeditor.com/ticket/8111)

In future releases we are planning to use doctype in our HTML files but currently we need to go on without it.

Any help is highly appreciated. Thanks in advance.