Thread:Extension talk:WYSIWYG/WYSIWYG-CKEditor extension causes "edit" page to load blank/reply (4)

I had the same issue, because I installed WYSIWYG-CKEditor extension at the wrong place on my web server... After WYSIWYG-CKeditor-CKeditor_v4.zip's extraction i n "/extensions" folder, I had an "/extensions/WYSIWYG-CKeditor-CKeditor_v4" folder containing folders WYSIWYG, SemanticForms, and WikiEditor. I had to move those 3 folders respectively to "/extensions/WYSIWYG", "/extensions/SemanticForms" and "/extensions/WikiEditor" before it worked. Basic, but perhaps it will help you...