I have been using lightroom 5.7 for some time. Recently, it just stopped importing images. I have changed catalogs, and tried a new catalog to no avail. Is it possible to uninstall and then reinstall it? (I downloaded the copy that I am now using, it is not on a CD/DVD) Would upgrading to lightroom 6 fix the problem. I have keep all of my pictures on an external hard disk.
Please make sure that all the panels on the right are expanded in the import window.
Also you may uninstall and reinstall Lightroom, if you have the serial number with you.
Please let us know if it helps.