OK, I resorted to the only way I know how to get their attention.  This is what I posted on their Facebook page:

There is an issue in QBO where the tab function does not work entering bills and checks. It gets "stuck" on the + on the far left, and one must use a mouse to get to the Category. Several of us have contacted support - only to be told it's our browser. Not the browser - same issue in Chrome, Edge, or using an incognito page. Same issue on laptops or desktops. It doesn't get escalated to engineering, because we are told on the phone that we have to stay on the phone for it to be escalated. This is NOT what you tell a bookkeeper or accountant during tax season, or any other time of year. We don't have time to sit on the phone with you while you figure out what is wrong with your program. Look at your community message boards, and look for the thread "Tabbing from one field to another". This issue NEEDS TO BE FIXED.

So we will see if they respond.  They usually do, because they don't want bad press on the Public Facebook page.