Hi samanthab ,
Which version of Lightroom and Photoshop are you using?
Please make sure both are up to date.
See a similar thread Files Don't Show up in Lightroom 4 After Saving From Photoshop
I'm using Lightroom 5 and Photoshop CC
If using Photoshop CC make sure it is up to date in Creative Cloud Application
Also ensure Lightroom is updated to 5.7.1
Let us know if that helps
Okay, I have them both updating now so I shall see what happens! Thank you
Have the latest cc updates. This doesn't help! It only opens photoshop window and does nothing. All my work stuck! Using latest OS X