that does actually seem to have been the issue, the top entry there is a journal entry.  not sure why its showing there in sales.  but it seems that unchecking that one does allow the Print Transactions to be clickable.

Before you said this, I figured out another way.  I thought it was because the date was All and sorting by customer.  So I set the date to when I wanted to start, which was 1/1/2016 to today.  I then could check all, and hit print transactions, but it said I could only print 50 at a time.  So I set the display to 50 invoices, and then checked all on that page, printed all those, went to next page, printed all those etc etc.

Thanks!