How do I located the cause of this problem? I have tried turning off lots of modules to no avail.
Features that used to work don't anymore. When editing a page the WYSIWYG editor (ckeditor) doesn't appear anymore. When in Date Wizard the "Advanced Options" triangle doesn't have anything to reveal and the same sort of thing happens in the MediaFront Presets options (now deactivated).
I am using D 7.17. Where do I start to look?