I have been using Elements 6 for years and have 2600 or so photos there. I downloaded a trial version of Lightroom and tried to transfer my Elements catalogs to Lightroom to be sure that I could work with Lightroom.
I followed the Adobe Lightroom instructions for importing Elements into Lightroom. However it seems that the vast majority of the photos did not transfer to lightroom. Those that did transfer appear correct. Those that did not transfer only have the photo file number and a blank image in Lightroom. Does the trial version limit the number of photos imported or do I have another problem here?
The Images are showing blank in Lightroom catalog is either missing or moved to different location on your system hard drive. You can relocate those Images in Lightroom catalog Refer:Adobe Photoshop Lightroom Help | Locate missing photos
Lightroom trial works as the Licensed version till the trial left.
You can refer the correct workflow for moving Elements Catalog to Lightroom.
Hope it helps.