(THE FOUR SHADES OF GREY)
- UN-SELECTED IMAGE BORDERS ARE MID-GREY.
- THE FIRST IMAGE SELECTED IS THE “PRIMARY” OR “MOST SELECTED” IMAGE WITH A VERY LIGHT GREY BORDER.
- ANY FURTHER IMAGES SELECTED BY HOLDING [CTRL] OR [COMMAND] OR [SHIFT] KEYS, BECOME THE “SECONDARY” SELECTED FILES WITH A LIGHT GREY BORDER.
- IMAGES WITH A VIRTUAL COPY BOTH SHOW AS DARK GREY IN LIBRARY GRID MODE.
To 'drag' an image to a collection you must click the mouse cursor exactly on the IMAGE part of the preview thumbnail. Clicking on the grey border does not work.
Although helpful about virtual copies this answer did not address the problem about images being frozen so they could not be opened or moved.
When you say "could not be opened"- what are you referring to? A double click of the mouse should view the clicked image in Loupe view- the same as pressing [E] on the keyboard for an enlarged view. (And a second double-click will take you back to library grid view.)
To "open" an image in the Development module requires you to select the image then press [D] or click on the [Develop] button.
When you say "could not be ...moved" -what are you referring to? Are you trying to move an image file from its place in a folder to another folder? Are you just wanting it in a collection? When you drag an image to a collection you are only placing a link to the image in the collection- not actually moving any file. The image will stay exactly where it is in its original folder and will remain as a thumbnail preview in the Library Grid view.
Are you having any "mouse" problems that may be changing its actions in LR ?
Do you see an exclamation mark on any image borders ?
Let's keep working on this. I am curious to see you find an answer.