I'm sure this isn't new....I thought I was careful in cleaning up extraneous files this morning, but when I returned (reopened the online versions), things had changed ...and... apparently, I broke the association between the schematic and the PCB files.  I have them both the schematic and PCB files open (tabs at the top), but after I do updates in the schematic and attempt to update the PCB, I get an error that says there is no PCB created.  Would I like to create one?   Of course not...update the one I have open! How do I fix this? Thanks, Dave