Thread:Extension talk:WYSIWYG/Problem: latest version (1.6.0 7) breaks HTML characters when switching from text editor to WYSIWYG editor/reply (6)

Hi EPiSKiNG, I think there is an open issue about it already in bugzilla. But unfortunately IE9 is not yet supported by WYSIWYG (see this thread for details: Which browsers does WYSIWYG support).