I'm back from office, where i have Windows Vista. On Windows and MSIE - no problem, Chrome - no problem, Firefox - the same behavior, as i described.
Status: I logged into your demo site as employee. I attached a simple note to contact Smith Admin. Editing the note - no text, no cursor, i can't write anything.
I opened WebConsole, JS logging enabled, CSS and NET disabled.
Click on the BOLD button:
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[19:58:17.567] TypeError: this.document.getWindow(...).$ is undefined @ http://demo.epesibim.com/modules/Libs/CKEditor/ckeditor/ckeditor.js:313
Click on the SOURCE button:
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[19:58:54.278] TypeError: d is null @ http://demo.epesibim.com/modules/Libs/CKEditor/ckeditor/ckeditor.js:678
Nothing other i can do. Click Save note and i'm back in view of the contact with attached notes. The note is not changed, nothing in note`s history.
Editing second time - empty simple window without CKEditor. I can write text into the simple window, Save and text is saved.
I didn't see any other errors on WebConsole.
Maybe it's problem in Gecko and the solution is to wait for newer version of FF 😉