– Which OS?
– Look in your Links panel to see if your images are linked.
– Try trashing your InDesign preferences:
Close and relaunch InDesign, and IMMEDIATELY hold down Ctrl + Alt + Shift (Windows) or Cmd + Ctrl + Opt + Shift (Mac), and respond in the affirmative to the dialog asking if you really want to replace the preferences. you must be extremely fast on the keyboard (if you don’t see the confirmation prompt, you were too slow)
You may have to do it a couple of times before you get the hang of it!
I'll bet you've put them on a non-printing layer, but that doesn't explain the lack of links, unless you used copy/paste instead of File > Place....
OS X El Capitan.
The links show up in the links panel and I used File>Place to insert them.
I will try trashing the preferences...
On a MAC, what key would be Opt?
I am using a PC keyboard
Most likely Alt.
So the links are in the Links panel, but not in the page thumbnails? You might have that turned off in the panel options. Did you check to be sure the images are on a printing layer?
SO resetting the preferences did not fix it.
How do I tell if they're on a printing layer?
And yes, if I click over to the LAYERS panel I can see the images on the layers, and if I go to LINKS, they're listed in there.
I also did not see a place to make a change re: panel options.
InDesign CS5.5 (or CS6) is not supported under El Capitan. You need to revert your OS or upgrade to CC2015.4
Ok, I will try that
Don't mess with the OS yet.
The fast way to tell if a layer is non-printing is to look at the name. If the type is Italic it's non-printing. You can also select the layer, then choose Layer Options from the panel flyout menu.
It looks like that fixed it!!!!!
That's good news but bear in mind it may have fixed this particular issue but you may have others later on, just be aware, and if you're doing a lot of professional work consider whether you should upgrade.