Totally agree with UrbanLedger.  Trying to export data for a new client today and not only is there no client list when I sign into QBO, there's NOTHING...it's just a big white screen.  Earlier I could at least get into my QBOA (where I still couldn't see the client list either on the screen or in the dropdown).  Tried the fixes suggested and was excited but should have known they wouldn't work easily.  When I try to replace the URL with the companyID it just redirects me back to that pretty white page of nothing. 

I finally figured out that if I open IE in private browsing and change the settings (gear>>internet options>>privacy) to uncheck pop-up blocker and uncheck "disable toolbars and extensions when inprivate browsing starts" then the fix suggested above where you paste the URL with companyID actually works!

But it shouldn't be this complicated and time-consuming.  All this research and hacking is non-billable time for me and I'm two hours into what should have been a 10-minute process.