Why do I get a blue rectangle covering photo in Develop module?

Question

I have purchased upgrade to LR6 (or is it LR CC?).  The new software downloaded, installed, updated the catalog so it seems to function normally.  When I first opened the program, it seemed ok, but soon a large blue rectangle (with an X across it) appeared over the selected photo in the Library module.  I signed out and signed back in; I restarted my computer.  The rectangle was still there, but I saw that no module was highlighted.  When I clicked on Library, the rectangle disappeared.  So, I thought I'd fixed the problem.  BUT, the rectangle persists in the Develop module (only there).  The controls do seem to work (if I click the crop rectangle, I can see it in the upper right preview window), but I can't see through the rectangle to actually edit anything. 
Any ideas?  (I run Windows 7, 64-bit)
Gail Goldey

Answer 1

Dear Jim,
I appreciate your continuing help on this.  What I've been told is that
this suggestion is a bit backwards. System is set up to use whichever card
the software calls for.  Computer has no way of knowing what LR wants or
needs; it's the software (LR) that has to choose among the available
cards.  I don't know how to tell LR to choose the NVIDIA--LR should be set
up to make that choice.  So, this sounds like a software problem.  Perhaps
you can ask how to tell LR to do this?  I'm not sure I can find this out.
(LR5.7 didn't have this issue, so it's somewhere in the changed software;
system is unchanged.)
The following is generic--but I hope you'll find it of some use.
I can't be alone in being frustrated by the need for expert advice whenever
Adobe does a software update or upgrade.  If my system is adequate and
up-to-date, why should it take hours and hours of my time (and yours), and
possibly some esoteric tweak, to fix a problem?
Though you have been working hard to be helpful, Adobe generally is
not--unless one wants to spend hours repeating oneself on the phone and
days waiting for a query to reach the proper level, etc.  Been there; done
that.  It isn't fun.  Even community inquiries (like how to deal with the
awful new Windows email interface) more often than not go unanswered.
Adobe seems to be trying to get individual and non-professional
photographers to increase or upgrade their involvement with Adobe software
and related products. Perhaps many such users would be happy to turn off
their GPUsas I am notbut it seems to me that Adobe needs to think more
about how ordinary people, not just sophisticated computer users, can work
with its software.  I'm pretty sure that expert users also would be happier
with more seamless transitions.
Thanks for hearing me out.  Trying to be helpful and not just complaining.
Gail