I have been using Lightroom 5.6 for weeks. Today I went to open a catalog and I got the message "assertion failure". I have gone through Adobe's posted fix for this, the Pictures folder is linked to My Pictures folder. Still no luck, in fact Light room will not open at all. I get the name of the catalog, I tried to open earlier, across my screen and the message "assertion failure". I am running Windows 7. Does anyone know of a fix for this??