Thanks. I was able to resolve it.
Deactivating the one the first one that failed to drag seemed to free up the others to work. Thanks for the tip @shellbot.
Ok thanks let me try that.
It affects WordPress plugins and commercial plugins alike. The plugins are arranged in alphabetical order and after “category archive” widget, none of the rest drag over to sidebar. This doesn’t seem to have anything to do with it being an outside plugin.
