Problem with Viewing Images

Question

I have been working in LR 5.2 with normal performance, settings etc.  I have not made any changes in preferences, or the different settings to the best of my knowledge..  I shutdown, normally without any error message, to include doing my normal back up.  Today when opening LR all opens as should with the exception that all my images in the catalogue are "grayed out".  In Library module all the images are there with appropriate metadata showing, but in grid mode, al lthe images are just gray squares with the proper naming and extension showing. In Loupe mode the same gray image appears.  In the Develop module, the image is there with proper title and information to include the appropriate histogram in color, but the image is just a black square. 
All my drop down menus are there and seem to be working normally.  I can open the images in Photoshop or Bridge and they all appear normal with appropriate color etc. To the best of my knowledge, I have not made any changes within the LR program.  This is the first time for this problem.
I have researched LR information and problems but cannot seem to find a solution.  Suggestions?

Answer 1

Jim:
Thank you so much for giving me some recommendations.  I did try the
suggestion link, and that did not seem to fix the problem.  However:
It appears the problem did stem from a corrupt monitor ICC profile.   I
just stumbled on a possible fix via Google and it appears to work.  If you
should be faced with this from another PC user with Windows 7, the fix that
worked for me is:
1.)  Bring up your monitor resolution profile selection.  If you have more
than one monitor bring the resolution profile up on each monitor separately
to ensure there is a "fix" on each monitor, one at a time.
2.)  Go to "Advance Settings"
3.)  Go to "Color Management " tab and click on "Color Management".
4.)  Color management dialogue box opens and then go to that dialogue
box "Advance" tab
5.)  Go to Windows Color System Defaults
6.)  Go to "Device Profile" drop down box
7.)  Review the multitude of profiles listed there and select the profile
that is identified as "System Default":
8.)  For my Dell S2440L monitors the default is "System default (sRGB
IEC61966-2.1)"
9.) Select the identified system default profile using a double click, then
close.
The primary monitor that I normally use to display LR had a different
setting.  How that happened I have no clue.  I managed to check this on the
secondary monitor and noticed that the "Device Profile" was different from
the primary monitor.  I changed the secondary monitor to the correct device
profile, and it appears to be working normally.  Interestingly enough, I
was having the problem of grayed out images regardless of what monitor was
being used, but it appears LR takes its information from the designated
primary monitor.
Thanks again, and I hope this helps.
tom45